@inbook{https://resolver.caltech.edu/CaltechAUTHORS:20140409-085315609,
    chapter = "Measurement of the Cosmic-Ray Be/B Ratio and the Age of Cosmic Rays",
    year = "1973",
    url = "https://resolver.caltech.edu/CaltechAUTHORS:20140409-085315609",
    id = "record"
}


@inbook{https://resolver.caltech.edu/CaltechAUTHORS:20140409-090240805,
    chapter = "The Elemental Abundance Ratios of Interstellar Secondary and Primary Cosmic Rays",
    year = "1973",
    url = "https://resolver.caltech.edu/CaltechAUTHORS:20140409-090240805",
    id = "record"
}