@other{https://resolver.caltech.edu/CaltechTHESIS:01192010-090920179,
    title = "Nonspherical perturbations of relativistic gravitational collapse",
    url = "https://resolver.caltech.edu/CaltechTHESIS:01192010-090920179",
    id = "record",
    doi = "10.7907/1EGC-Y160"
}