@other{https://resolver.caltech.edu/CaltechETD:etd-09022008-152652,
    title = "The structure of clusters of galaxies and the angular size-redshift test",
    year = "1976",
    url = "https://resolver.caltech.edu/CaltechETD:etd-09022008-152652",
    id = "record",
    doi = "10.7907/6F00-K950"
}