@other{https://resolver.caltech.edu/CaltechEERL:EERL-2004-03,
    title = "Results of Millikan Library Forced Vibration Testing",
    year = "2008",
    url = "https://resolver.caltech.edu/CaltechEERL:EERL-2004-03",
    id = "record"
}


@other{https://resolver.caltech.edu/CaltechEERL:EERL-2006-02,
    title = "Time-Frequency Analysis of Systems with Changing Dynamic Properties",
    year = "2006",
    url = "https://resolver.caltech.edu/CaltechEERL:EERL-2006-02",
    id = "record"
}