@article{04010572,
title = {On a quasiordering of bipartite graphs.},
journal = {Publications de l'Institut Math\'ematique. Nouvelle S\'erie},
volume = {39(53)},
year = {1986},
pages = {11-15},
zbl = {0623.05050},
language = {en},
url = {http://dml.mathdoc.fr/item/04010572}
}
Gutman, Ivan; Fuji, Zhang. On a quasiordering of bipartite graphs.. Publications de l'Institut Mathématique. Nouvelle Série, Tome 39(53) (1986) pp. 11-15. http://gdmltest.u-ga.fr/item/04010572/