@other{https://resolver.caltech.edu/CaltechETD:etd-01262009-133713,
    title = "The origin of harmonic tremor at Old Faithful geyser",
    year = "1996",
    url = "https://resolver.caltech.edu/CaltechETD:etd-01262009-133713",
    id = "record",
    doi = "10.7907/X1RD-ZV73"
}