@other{https://resolver.caltech.edu/CaltechTHESIS:01252016-081748086,
    title = "A scaling technique for the design of idealized electromagnetic lenses",
    url = "https://resolver.caltech.edu/CaltechTHESIS:01252016-081748086",
    id = "record",
    doi = "10.7907/N9WZ-SP03"
}