@other{https://resolver.caltech.edu/CaltechETD:etd-03102008-090242,
    title = "Studies of calcium isotope fractionation found in nature and produced during ion sputtering",
    year = "1979",
    url = "https://resolver.caltech.edu/CaltechETD:etd-03102008-090242",
    id = "record",
    doi = "10.7907/nxss-sh80"
}