@other{https://resolver.caltech.edu/CaltechETD:etd-05092008-145009,
    title = "A spectroscopic investigation of four O-type subdwarfs",
    url = "https://resolver.caltech.edu/CaltechETD:etd-05092008-145009",
    id = "record",
    doi = "10.7907/9AF4-BY55"
}