@other{https://resolver.caltech.edu/CaltechTHESIS:09012015-094327595,
    title = "Range of validity of the method of averaging",
    url = "https://resolver.caltech.edu/CaltechTHESIS:09012015-094327595",
    id = "record",
    doi = "10.7907/4S5M-N506"
}