@other{https://resolver.caltech.edu/CaltechTHESIS:09202010-080853201,
    title = "Some problems in global tomography: modeling the core-mantle boundary and statistical analysis of travel-time data",
    year = "1990",
    url = "https://resolver.caltech.edu/CaltechTHESIS:09202010-080853201",
    id = "record",
    doi = "10.7907/qneg-nb47"
}