@other{https://resolver.caltech.edu/CaltechETD:etd-11242008-082928,
    title = "A Study of Flutter in One Degree of Freedom",
    year = "1942",
    url = "https://resolver.caltech.edu/CaltechETD:etd-11242008-082928",
    id = "record",
    doi = "10.7907/NX9K-JT57"
}


@other{https://resolver.caltech.edu/CaltechETD:etd-11062008-151722,
    title = "The Effect of Gunfire on the Longitudinal Motion of an Airplane",
    year = "1941",
    url = "https://resolver.caltech.edu/CaltechETD:etd-11062008-151722",
    id = "record",
    doi = "10.7907/GQG7-6C62"
}