@article {IOPORT.50244037,
    author       = {Hammack, Richard},
    title        = {Isomorphic components of direct products of bipartite graphs},
    year         = {2006},
    journal      = {Discussiones Mathematicae Graph Theory},
    volume       = {26},
    number       = {2},
    pages        = {231-248},
    identifier   = {50244037},
}