@article{https://resolver.caltech.edu/CaltechAUTHORS:20140811-125617779,
    title = "Analysis of the convergence properties of Rubenstein's method for the determination of the lower modes of vibration of a multi-degree of freedom system",
    journal = "Bulletin of the Seismological Society of America",
    year = "1964",
    url = "https://resolver.caltech.edu/CaltechAUTHORS:20140811-125617779",
    id = "record",
    issn = "0037-1106",
    volume = "54"
}


@article{https://resolver.caltech.edu/CaltechAUTHORS:CAUjasa61,
    title = "Effect of Damping on the Natural Frequencies of Linear Dynamic Systems",
    journal = "Journal of the Acoustical Society of America",
    year = "1961",
    url = "https://resolver.caltech.edu/CaltechAUTHORS:CAUjasa61",
    id = "record",
    issn = "0001-4966",
    doi = "10.1121/1.1908470",
    volume = "33"
}