@other{https://resolver.caltech.edu/CaltechETD:etd-03192009-091419,
    title = "A General Similarity Theory of Partial Differential Equations and its Use in the Solution of Problems in Aeronautics",
    url = "https://resolver.caltech.edu/CaltechETD:etd-03192009-091419",
    id = "record",
    doi = "10.7907/9142-KZ49"
}