@other{https://resolver.caltech.edu/CaltechETD:etd-06252004-100232,
    title = "An Ink Recording Oscillograph for Steady State A.C. Phenomena in the Audio Range",
    url = "https://resolver.caltech.edu/CaltechETD:etd-06252004-100232",
    id = "record",
    doi = "10.7907/F2B9-4M08"
}


@other{https://resolver.caltech.edu/CaltechETD:etd-02252005-132801,
    title = "A Study of an Artificial Telephone Line",
    url = "https://resolver.caltech.edu/CaltechETD:etd-02252005-132801",
    id = "record",
    doi = "10.7907/KARN-PM22"
}