@other{https://resolver.caltech.edu/CaltechTHESIS:03212013-102207354,
    title = "Periodic solutions of integro-differential equations which arise in population dynamics",
    year = "1979",
    url = "https://resolver.caltech.edu/CaltechTHESIS:03212013-102207354",
    id = "record",
    doi = "10.7907/cd8g-fq50"
}