@other{https://resolver.caltech.edu/CaltechETD:etd-11082007-105043,
    title = "Spectrum efficient frequency assignment for cellular radio",
    year = "1990",
    url = "https://resolver.caltech.edu/CaltechETD:etd-11082007-105043",
    id = "record",
    doi = "10.7907/q2qb-hh14"
}