@other{https://resolver.caltech.edu/CaltechTHESIS:04132011-081816354,
    title = "An Investigation of the Earth's Free OsciIIations",
    year = "1961",
    url = "https://resolver.caltech.edu/CaltechTHESIS:04132011-081816354",
    id = "record",
    doi = "10.7907/S9RW-R653"
}


@other{https://resolver.caltech.edu/CaltechETD:etd-01082004-111506,
    title = "Creep Measurements in Igneous Rocks with Some Applications to Aftershock Theory",
    year = "1955",
    url = "https://resolver.caltech.edu/CaltechETD:etd-01082004-111506",
    id = "record",
    doi = "10.7907/A2KE-9Y60"
}