<h1>Leske, Richard</h1>
<h2>Article from <a href="https://authors.library.caltech.edu">CaltechAUTHORS</a></h2>
<ul>
<li>Cuesta, M. E. and Khoo, L. Y., el al. (2025) <a href="https://authors.library.caltech.edu/records/vb2ea-1f635">Comparing Methods for Calculating Solar Energetic Particle Intensities: Rebinning versus Spectral Binning</a>; Astrophysical Journal; Vol. 980; No. 2; 235; <a href="https://doi.org/10.3847/1538-4357/adaea9">10.3847/1538-4357/adaea9</a></li>
<li>Mitchell, J. G. and Christian, E. R., el al. (2025) <a href="https://authors.library.caltech.edu/records/dd98f-hrn77">Delay of Near-relativistic Electrons with Respect to Type III Radio Bursts throughout the Inner Heliosphere</a>; Astrophysical Journal; Vol. 980; No. 1; 96; <a href="https://doi.org/10.3847/1538-4357/adaa7c">10.3847/1538-4357/adaa7c</a></li>
<li>Cohen, C. M. S. and Mason, G. M., el al. (2025) <a href="https://authors.library.caltech.edu/records/1yy58-ja209">Longitudinal Dependence of Heavy Ion Composition in the 2021 October 28 Ground Level Enhancement Event</a>; Astrophysical Journal Letters; Vol. 978; No. 2; L35; <a href="https://doi.org/10.3847/2041-8213/ada24b">10.3847/2041-8213/ada24b</a></li>
<li>Khoo, L. Y. and Sánchez-Cano, B., el al. (2024) <a href="https://authors.library.caltech.edu/records/nqj6n-xa198">Multispacecraft Observations of a Widespread Solar Energetic Particle Event on 2022 February 15–16</a>; The Astrophysical Journal; Vol. 963; No. 2; 107; <a href="https://doi.org/10.3847/1538-4357/ad167f">10.3847/1538-4357/ad167f</a></li>
<li>Giacalone, Joe and Cohen, C. M. S., el al. (2023) <a href="https://authors.library.caltech.edu/records/gghcd-wc441">Analyses of ~0.05–2 MeV Ions Associated with the 2022 February 16 Energetic Storm Particle Event Observed by Parker Solar Probe</a>; Astrophysical Journal; Vol. 958; No. 2; 144; <a href="https://doi.org/10.3847/1538-4357/acfb86">10.3847/1538-4357/acfb86</a></li>
<li>Binns, W. R. and Wiedenbeck, M. E., el al. (2022) <a href="https://resolver.caltech.edu/CaltechAUTHORS:20220908-184327219">The Isotopic Abundances of Galactic Cosmic Rays with Atomic Number 29 ≤ Z ≤ 38</a>; Astrophysical Journal; Vol. 936; No. 1; 13; <a href="https://doi.org/10.3847/1538-4357/ac82e7">10.3847/1538-4357/ac82e7</a></li>
<li>Chhiber, R. and Matthaeus, W. H., el al. (2021) <a href="https://resolver.caltech.edu/CaltechAUTHORS:20210608-140607023">Magnetic field line random walk and solar energetic particle path lengths. Stochastic theory and PSP/IS⊙IS observations</a>; Astronomy and Astrophysics; Vol. 650; Art. No. 	A26; <a href="https://doi.org/10.1051/0004-6361/202039816">10.1051/0004-6361/202039816</a></li>
<li>Mitchell, J. G. and de Nolfo, G. A., el al. (2020) <a href="https://resolver.caltech.edu/CaltechAUTHORS:20201008-083809185">Small Electron Events Observed by Parker Solar Probe/IS⊙IS during Encounter 2</a>; Astrophysical Journal; Vol. 902; No. 1; Art. No. 20; <a href="https://doi.org/10.3847/1538-4357/abb2a4">10.3847/1538-4357/abb2a4</a></li>
<li>Kouloumvakos, Athanasios and Vourlidas, Angelos, el al. (2020) <a href="https://resolver.caltech.edu/CaltechAUTHORS:20200819-162804339">The Solar Origin of Particle Events Measured by Parker Solar Probe</a>; Astrophysical Journal; Vol. 899; No. 2; Art. No. 107; <a href="https://doi.org/10.3847/1538-4357/aba5a1">10.3847/1538-4357/aba5a1</a></li>
<li>Desai, M. I. and Mitchell, D. G., el al. (2020) <a href="https://resolver.caltech.edu/CaltechAUTHORS:20200203-092721940">Properties of Suprathermal-through-energetic He Ions Associated with Stream Interaction Regions Observed over the Parker Solar Probe's First Two Orbits</a>; Astrophysical Journal Supplement Series; Vol. 246; No. 2; Art. No. 56; <a href="https://doi.org/10.3847/1538-4365/ab65ef">10.3847/1538-4365/ab65ef</a></li>
<li>Hill, M. E. and Mitchell, D. G., el al. (2020) <a href="https://resolver.caltech.edu/CaltechAUTHORS:20200203-092722235">Small, Low-energy, Dispersive Solar Energetic Particle Events Observed by Parker Solar Probe</a>; Astrophysical Journal Supplement Series; Vol. 246; No. 2; Art. No. 65; <a href="https://doi.org/10.3847/1538-4365/ab643d">10.3847/1538-4365/ab643d</a></li>
<li>Joyce, C. J. and McComas, D. J., el al. (2020) <a href="https://resolver.caltech.edu/CaltechAUTHORS:20200203-092721619">Energetic Particle Observations from the Parker Solar Probe Using Combined Energy Spectra from the IS⊙IS Instrument Suite</a>; Astrophysical Journal Supplement Series; Vol. 246; No. 2; Art. No. 41; <a href="https://doi.org/10.3847/1538-4365/ab5948">10.3847/1538-4365/ab5948</a></li>
<li>Leske, R. A. and Christian, E. R., el al. (2020) <a href="https://resolver.caltech.edu/CaltechAUTHORS:20200203-131825142">Observations of the 2019 April 4 Solar Energetic Particle Event at the Parker Solar Probe</a>; Astrophysical Journal Supplement Series; Vol. 246; No. 2; Art. No. 35; <a href="https://doi.org/10.3847/1538-4365/ab5712">10.3847/1538-4365/ab5712</a></li>
<li>Cohen, C. M. S. and Christian, E. R., el al. (2020) <a href="https://resolver.caltech.edu/CaltechAUTHORS:20200203-104219201">Energetic Particle Increases Associated with Stream Interaction Regions</a>; Astrophysical Journal Supplement Series; Vol. 246; No. 2; Art. No. 20; <a href="https://doi.org/10.3847/1538-4365/ab4c38">10.3847/1538-4365/ab4c38</a></li>
<li>Giacalone, J. and Mitchell, D. G., el al. (2020) <a href="https://resolver.caltech.edu/CaltechAUTHORS:20200203-092721189">Solar Energetic Particles Produced by a Slow Coronal Mass Ejection at ∼0.25 au</a>; Astrophysical Journal Supplement Series; Vol. 246; No. 2; Art. No. 29; <a href="https://doi.org/10.3847/1538-4365/ab5221">10.3847/1538-4365/ab5221</a></li>
<li>Schwadron, N. A. and Bale, S., el al. (2020) <a href="https://resolver.caltech.edu/CaltechAUTHORS:20200203-092721301">Seed Population Preconditioning and Acceleration Observed by the Parker Solar Probe</a>; Astrophysical Journal Supplement Series; Vol. 246; No. 2; Art. No. 33; <a href="https://doi.org/10.3847/1538-4365/ab5527">10.3847/1538-4365/ab5527</a></li>
<li>Wiedenbeck, M. E. and Bučik, R., el al. (2020) <a href="https://resolver.caltech.edu/CaltechAUTHORS:20200203-092721818">³He-rich Solar Energetic Particle Observations at the Parker Solar Probe and near Earth</a>; Astrophysical Journal Supplement Series; Vol. 246; No. 2; Art. No. 42; <a href="https://doi.org/10.3847/1538-4365/ab5963">10.3847/1538-4365/ab5963</a></li>
<li>Ghanbari, Keyvan and Florinski, Vladimir, el al. (2019) <a href="https://resolver.caltech.edu/CaltechAUTHORS:20190903-130240306">Galactic Cosmic Rays Modulation in the Vicinity of Corotating Interaction Regions: Observations During the Last Two Solar Minima</a>; Astrophysical Journal; Vol. 882; No. 1; Art. No. 54; <a href="https://doi.org/10.3847/1538-4357/ab31a5">10.3847/1538-4357/ab31a5</a></li>
<li>Israel, M. H. and Lave, K. A., el al. (2018) <a href="https://resolver.caltech.edu/CaltechAUTHORS:20180921-095050945">Elemental Composition at the Cosmic-Ray Source Derived from the ACE-CRIS Instrument. I. _6C to _(28)Ni</a>; Astrophysical Journal; Vol. 865; No. 1; Art. No. 69; <a href="https://doi.org/10.3847/1538-4357/aad867">10.3847/1538-4357/aad867</a></li>
<li>Luhmann, J. G. and Mays, M. L., el al. (2017) <a href="https://resolver.caltech.edu/CaltechAUTHORS:20170907-080455747">Modeling solar energetic particle events using ENLIL heliosphere simulations</a>; Space Weather; Vol. 15; No. 7; 934-954; <a href="https://doi.org/10.1002/2017SW001617">10.1002/2017SW001617</a></li>
<li>McComas, D. J. and Burnham, J. A., el al. (2016) <a href="https://resolver.caltech.edu/CaltechAUTHORS:20140709-091502003">Integrated Science Investigation of the Sun (ISIS): Design of the Energetic Particle Investigation</a>; Space Science Reviews; Vol. 204; No. 1; 187-256; <a href="https://doi.org/10.1007/s11214-014-0059-1">10.1007/s11214-014-0059-1</a></li>
<li>Binns, W. R. and Israel, M. H., el al. (2016) <a href="https://resolver.caltech.edu/CaltechAUTHORS:20160422-072602817">Observation of the ^(60)Fe nucleosynthesis-clock isotope in galactic cosmic rays</a>; Science; Vol. 352; No. 6286; 677-680; <a href="https://doi.org/10.1126/science.aad6004">10.1126/science.aad6004</a></li>
<li>Dresing, N. and Cohen, C. M. S., el al. (2014) <a href="https://resolver.caltech.edu/CaltechAUTHORS:20141016-091522674">Approaching Solar Maximum 24 with STEREO—Multipoint Observations of Solar Energetic Particle Events</a>; Brazilian Journal of Physics; Vol. 44; No. 5; 504-511; <a href="https://doi.org/10.1007/s13538-014-0227-5">10.1007/s13538-014-0227-5</a></li>
<li>Richardson, I. G. and von Rosenvinge, T. T., el al. (2014) <a href="https://resolver.caltech.edu/CaltechAUTHORS:20140623-132927361">&gt; 25 MeV Proton Events Observed by the High Energy Telescopes on the STEREO A and B Spacecraft and/or at Earth During the First ~ Seven Years of the STEREO Mission</a>; Solar Physics; Vol. 289; No. 8; 3059-3107; <a href="https://doi.org/10.1007/s11207-014-0524-8">10.1007/s11207-014-0524-8</a></li>
<li>Lave, K. A. and Wiedenbeck, M. E., el al. (2013) <a href="https://resolver.caltech.edu/CaltechAUTHORS:20130725-072008737">Galactic Cosmic-Ray Energy Spectra and Composition during the 2009-2010 Solar Minimum Period</a>; Astrophysical Journal; Vol. 770; No. 2; Art. No. 117; <a href="https://doi.org/10.1088/0004-637X/770/2/117">10.1088/0004-637X/770/2/117</a></li>
<li>Russell, C. T. and Mewaldt, R. A., el al. (2013) <a href="https://resolver.caltech.edu/CaltechAUTHORS:20130723-144023646">The Very Unusual Interplanetary Coronal Mass Ejection of 2012 July 23: A Blast Wave Mediated by Solar Energetic Particles</a>; Astrophysical Journal; Vol. 770; No. 1; Art. No. 38; <a href="https://doi.org/10.1088/0004-637X/770/1/38">10.1088/0004-637X/770/1/38</a></li>
<li>Leske, R. A. and Cummings, A. C., el al. (2013) <a href="https://resolver.caltech.edu/CaltechAUTHORS:20140827-083853990">Anomalous and Galactic Cosmic Rays at 1 AU During the Cycle 23/24 Solar Minimum</a>; Space Science Reviews; Vol. 176; No. 1-4; 253-263; <a href="https://doi.org/10.1007/s11214-011-9772-1">10.1007/s11214-011-9772-1</a></li>
<li>Mason, G. M. and Li, G., el al. (2012) <a href="https://resolver.caltech.edu/CaltechAUTHORS:20130111-103610168">Interplanetary Propagation of Solar Energetic Particle Heavy Ions Observed at 1 AU and the Role of Energy Scaling</a>; Astrophysical Journal; Vol. 761; No. 2; Art. No. 104; <a href="https://doi.org/10.1088/0004-637X/761/2/104">10.1088/0004-637X/761/2/104</a></li>
<li>Leske, R. A. and Cohen, C. M. S., el al. (2012) <a href="https://resolver.caltech.edu/CaltechAUTHORS:20121207-133222594">Large Proton Anisotropies in the 18 August 2010 Solar Particle Event</a>; Solar Physics; Vol. 281; No. 1; 301-318; <a href="https://doi.org/10.1007/s11207-012-0018-5">10.1007/s11207-012-0018-5</a></li>
<li>Mewaldt, R. A. and Looper, M. D., el al. (2012) <a href="https://resolver.caltech.edu/CaltechAUTHORS:20121109-100850749">Energy Spectra, Composition, and Other Properties of Ground-Level Events During Solar Cycle 23</a>; Space Science Reviews; Vol. 171; No. 1-4; 97-120; <a href="https://doi.org/10.1007/s11214-012-9884-2">10.1007/s11214-012-9884-2</a></li>
<li>Chollet, E. E. and Mewaldt, R. A., el al. (2010) <a href="https://resolver.caltech.edu/CaltechAUTHORS:20110118-090120711">Multipoint connectivity analysis of the May 2007 solar energetic particle events</a>; Journal of Geophysical Research A; Vol. 115; Art. No. A12106; <a href="https://doi.org/10.1029/2010JA015552">10.1029/2010JA015552</a></li>
<li>Mewaldt, R. A. and Davis, A. J., el al. (2010) <a href="https://resolver.caltech.edu/CaltechAUTHORS:20101209-103120218">Record-setting Cosmic-ray Intensities in 2009 and 2010</a>; Astrophysical Journal Letters; Vol. 723; No. 1; L1-L6; <a href="https://doi.org/10.1088/2041-8205/723/1/L1">10.1088/2041-8205/723/1/L1</a></li>
<li>Wiedenbeck, M. E. and Cohen, C. M. S., el al. (2010) <a href="https://resolver.caltech.edu/CaltechAUTHORS:20100830-135106755">Heavy-ion Fractionation in the Impulsive Solar Energetic Particle Event of 2002 August 20: Elements, Isotopes, and Inferred Charge States</a>; Astrophysical Journal; Vol. 719; No. 2; 1212-1229; <a href="https://doi.org/10.1088/0004-637X/719/2/1212">10.1088/0004-637X/719/2/1212</a></li>
<li>Mulligan, T. and Blake, J. B., el al. (2009) <a href="https://resolver.caltech.edu/CaltechAUTHORS:20090808-142501681">Short-period variability in the galactic cosmic ray intensity: High statistical resolution observations and interpretation around the time of a Forbush decrease in August 2006</a>; Journal of Geophysical Research A; Vol. 114; No. A7; A07105; <a href="https://doi.org/10.1029/2008JA013783">10.1029/2008JA013783</a></li>
<li>George, J. S. and Lave, K. A., el al. (2009) <a href="https://resolver.caltech.edu/CaltechAUTHORS:20091009-094741170">Elemental Composition and Energy Spectra of Galactic Cosmic Rays During Solar Cycle 23</a>; Astrophysical Journal; Vol. 689; No. 2; 1666-1681; <a href="https://doi.org/10.1088/0004-637X/698/2/1666">10.1088/0004-637X/698/2/1666</a></li>
<li>von Rosenvinge, T. T. and Richardson, I. G., el al. (2009) <a href="https://resolver.caltech.edu/CaltechAUTHORS:20140827-101854474">The Solar Energetic Particle Event of 14 December 2006</a>; Solar Physics; Vol. 256; No. 1-2; 443-462; <a href="https://doi.org/10.1007/s11207-009-9353-6">10.1007/s11207-009-9353-6</a></li>
<li>Mewaldt, R. A. and Leske, R. A., el al. (2009) <a href="https://resolver.caltech.edu/CaltechAUTHORS:20090918-091120378">STEREO Observations of Energetic Neutral Hydrogen Atoms During the 2006 December 5 Solar Flare</a>; Astrophysical Journal Letters; Vol. 693; No. 1; L11-L15; <a href="https://doi.org/10.1088/0004-637X/693/1/L11">10.1088/0004-637X/693/1/L11</a></li>
<li>Binns, W. R. and Wiedenbeck, M. E., el al. (2008) <a href="https://resolver.caltech.edu/CaltechAUTHORS:BINnar08">The OB association origin of galactic cosmic rays</a>; New Astronomy Reviews; Vol. 52; No. 7-10; 427-430; <a href="https://doi.org/10.1016/j.newar.2008.05.008">10.1016/j.newar.2008.05.008</a></li>
<li>Sollitt, L. S. and Stone, E. C., el al. (2008) <a href="https://resolver.caltech.edu/CaltechAUTHORS:SOLapj08">A novel technique to infer ionic charge states of solar energetic particles</a>; Astrophysical Journal; Vol. 679; No. 1; 910-919; <a href="https://doi.org/10.1086/587121">10.1086/587121</a></li>
<li>Mason, G. M. and Leske, R. A., el al. (2008) <a href="https://resolver.caltech.edu/CaltechAUTHORS:MASapj08">Abundances and energy spectra of corotating interaction region heavy ions observed during solar cycle 23</a>; Astrophysical Journal; Vol. 678; No. 2; 1458-1470; <a href="https://doi.org/10.1086/533524">10.1086/533524</a></li>
<li>von Rosenvinge, T. T. and Reames, D. V., el al. (2008) <a href="https://resolver.caltech.edu/CaltechAUTHORS:20160630-091011138">The High Energy Telescope for STEREO</a>; Space Science Reviews; Vol. 136; No. 1-4; 391-435; <a href="https://doi.org/10.1007/978-0-387-09649-0_14">10.1007/978-0-387-09649-0_14</a></li>
<li>Mewaldt, R. A. and Cohen, C. M. S., el al. (2008) <a href="https://resolver.caltech.edu/CaltechAUTHORS:20140908-100838268">The Low-Energy Telescope (LET) and SEP Central Electronics for the STEREO Mission</a>; Space Science Reviews; Vol. 136; No. 1-4; 285-362; <a href="https://doi.org/10.1007/s11214-007-9288-x">10.1007/s11214-007-9288-x</a></li>
<li>Leske, R. A. and Mewaldt, R. A., el al. (2007) <a href="https://resolver.caltech.edu/CaltechAUTHORS:20100503-093124629">Solar Isotopic Composition as Determined Using Solar Energetic Particles</a>; Space Science Reviews; Vol. 130; No. 1-4; 195-205; <a href="https://doi.org/10.1007/s11214-007-9185-3">10.1007/s11214-007-9185-3</a></li>
<li>Wiedenbeck, M. E. and Binns, W. R., el al. (2007) <a href="https://resolver.caltech.edu/CaltechAUTHORS:20100909-133903373">An Overview of the Origin of Galactic Cosmic Rays as Inferred from Observations of Heavy Ion Composition and Spectra</a>; Space Science Reviews; Vol. 130; No. 1-4; 415-429; <a href="https://doi.org/10.1007/s11214-007-9198-y">10.1007/s11214-007-9198-y</a></li>
<li>Leske, R. A. and Mewaldt, R. A., el al. (2007) <a href="https://resolver.caltech.edu/CaltechAUTHORS:20100503-155507464">An Update on Ultra-Heavy Elements in Solar Energetic Particles above 10 MeV/Nucleon</a>; Space Science Reviews; Vol. 130; No. 1-4; 335-340; <a href="https://doi.org/10.1007/s11214-007-9191-5">10.1007/s11214-007-9191-5</a></li>
<li>Mewaldt, R. A. and Cohen, C. M. S., el al. (2007) <a href="https://resolver.caltech.edu/CaltechAUTHORS:20100506-100356849">On the Differences in Composition between Solar Energetic Particles and Solar Wind</a>; Space Science Reviews; Vol. 130; No. 1-4; 207-219; <a href="https://doi.org/10.1007/s11214-007-9187-1">10.1007/s11214-007-9187-1</a></li>
<li>Cohen, C. M. S. and Mewaldt, R. A., el al. (2007) <a href="https://resolver.caltech.edu/CaltechAUTHORS:20100503-100012820">Solar Elemental Composition Based on Studies of Solar Energetic Particles</a>; Space Science Reviews; Vol. 130; No. 1-4; 183-194; <a href="https://doi.org/10.1007/s11214-007-9218-y">10.1007/s11214-007-9218-y</a></li>
<li>Binns, W. R. and Wiedenbeck, M. E., el al. (2007) <a href="https://resolver.caltech.edu/CaltechAUTHORS:20140827-105038224">OB Associations, Wolf-Rayet Stars, and the Origin of Galactic Cosmic Rays</a>; Space Science Reviews; Vol. 130; No. 1-4; 439-449; <a href="https://doi.org/10.1007/s11214-007-9195-1">10.1007/s11214-007-9195-1</a></li>
<li>Binns, W. R. and Wiedenbeck, M. E., el al. (2006) <a href="https://resolver.caltech.edu/CaltechAUTHORS:BINjpcs06">Superbubbles, Wolf-Rayet stars, and the origin of galactic cosmic rays</a>; Journal of Physics: Conference Series; Vol. 47; 68-77; <a href="https://doi.org/10.1088/1742-6596/47/1/008">10.1088/1742-6596/47/1/008</a></li>
<li>Binns, W. R. and Wiedenbeck, M. E., el al. (2006) <a href="https://resolver.caltech.edu/CaltechAUTHORS:20110120-162201593">Wolf-Rayet stars, OB associations, and the origin
of galactic cosmic rays</a>; New Astronomy Reviews; Vol. 50; No. 7-8; 516-520; <a href="https://doi.org/10.1016/j.newar.2006.06.058">10.1016/j.newar.2006.06.058</a></li>
<li>Binns, W. R. and Wiedenbeck, M. E., el al. (2005) <a href="https://resolver.caltech.edu/CaltechAUTHORS:20140827-093644016">Cosmic-Ray Neon, Wolf-Rayet Stars, and the Superbubble Origin of Galactic Cosmic Rays</a>; Astrophysical Journal; Vol. 634; No. 1; 351-364; <a href="https://doi.org/10.1086/496959">10.1086/496959</a></li>
<li>Mewaldt, R. A. and Cohen, C. M. S., el al. (2005) <a href="https://resolver.caltech.edu/CaltechAUTHORS:20150323-154646214">Proton, helium, and electron spectra during the large solar particle events of October-November 2003</a>; Journal of Geophysical Research A; Vol. 110; No. A9; Art. No. A09S18; <a href="https://doi.org/10.1029/2005JA011038">10.1029/2005JA011038</a></li>
<li>Cohen, C. M. S. and Stone, E. C., el al. (2005) <a href="https://resolver.caltech.edu/CaltechAUTHORS:20140407-101736587">Heavy ion abundances and spectra from the large solar energetic particle events of October-November 2003</a>; Journal of Geophysical Research A; Vol. 110; No. A9; Art. No. A09S16; <a href="https://doi.org/10.1029/2005JA011004">10.1029/2005JA011004</a></li>
<li>Israel, M. H. and Binns, W. R., el al. (2005) <a href="https://resolver.caltech.edu/CaltechAUTHORS:20140826-114144077">Isotopic Composition of Cosmic Rays: Results from the Cosmic Ray Isotope Spectrometer on the ACE Spacecraft</a>; Nuclear Physics A; Vol. 758; 201-208; <a href="https://doi.org/10.1016/j.nuclphysa.2005.05.038">10.1016/j.nuclphysa.2005.05.038</a></li>
<li>Slocum, P. L. and Stone, E. C., el al. (2003) <a href="https://resolver.caltech.edu/CaltechAUTHORS:20140827-091516862">Elemental Fractionation in Small Solar Energetic Particle Events</a>; Astrophysical Journal; Vol. 594; No. 1; 592-604; <a href="https://doi.org/10.1086/376755">10.1086/376755</a></li>
<li>Niebur, S. M. and Scott, L. M., el al. (2003) <a href="https://resolver.caltech.edu/CaltechAUTHORS:20140826-164919486">Cosmic ray energy loss in the heliosphere: Direct evidence from electron-capture-decay secondary isotopes</a>; Journal of Geophysical Research A; Vol. 108; No. A10; Art. No. 8033; <a href="https://doi.org/10.1029/2003JA009876">10.1029/2003JA009876</a></li>
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