@other{https://thesis.library.caltech.edu/id/eprint/2722,
    author = "Pierce, John Robinson",
    title = "An Ink Recording Oscillograph for Steady State A.C. Phenomena in the Audio Range",
    year = "1936",
    url = "https://resolver.caltech.edu/CaltechETD:etd-06252004-100232",
    id = "https://thesis.library.caltech.edu/id/eprint/2722",
    doi = "10.7907/F2B9-4M08"
}


@other{https://thesis.library.caltech.edu/id/eprint/760,
    author = "Swedlund, Lloyd Edward",
    title = "A Study of an Artificial Telephone Line",
    year = "1928",
    url = "https://resolver.caltech.edu/CaltechETD:etd-02252005-132801",
    id = "https://thesis.library.caltech.edu/id/eprint/760",
    doi = "10.7907/KARN-PM22"
}