@other{https://resolver.caltech.edu/CaltechTHESIS:05312013-094528303,
    title = "Structure of the earth's core and lowermost mantle from seismic PKP waves",
    url = "https://resolver.caltech.edu/CaltechTHESIS:05312013-094528303",
    id = "record",
    doi = "10.7907/k5gh-th50"
}