@other{https://resolver.caltech.edu/CaltechTHESIS:03272012-160759964,
    title = "Hierarchy of Graph Isomorphism Testing",
    url = "https://resolver.caltech.edu/CaltechTHESIS:03272012-160759964",
    id = "record",
    doi = "10.7907/pgav-zy26"
}