@other{https://resolver.caltech.edu/CaltechEERL:1965.DYNL.1965.003,
    title = "Response of linear, viscous damped systems to excitations having time-varying frequency",
    url = "https://resolver.caltech.edu/CaltechEERL:1965.DYNL.1965.003",
    id = "record"
}


@other{https://resolver.caltech.edu/CaltechEERL:1965.DYNL.1965.004,
    title = "Response of linear, viscous damped systems to excitations having time-varying frequency",
    url = "https://resolver.caltech.edu/CaltechEERL:1965.DYNL.1965.004",
    id = "record"
}