@other{https://resolver.caltech.edu/CaltechETD:etd-09092008-135416,
    title = "Binary galaxies and groups of galaxies",
    year = "1976",
    url = "https://resolver.caltech.edu/CaltechETD:etd-09092008-135416",
    id = "record",
    doi = "10.7907/C4RG-BW87"
}