@other{https://resolver.caltech.edu/CaltechEERL:1967.DYNL.1967.002,
    title = "Spectral density of first order piecewise linear system excited by white noise",
    year = "1967",
    url = "https://resolver.caltech.edu/CaltechEERL:1967.DYNL.1967.002",
    id = "record"
}