@other{https://resolver.caltech.edu/CaltechTHESIS:03212013-145828508,
    title = "Exact solutions and transformation properties of nonlinear partial differential equations from general relativity",
    url = "https://resolver.caltech.edu/CaltechTHESIS:03212013-145828508",
    id = "record",
    doi = "10.7907/PXKA-1861"
}