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@article{KJM_2000_22_1_a6, author = {Ivan Gutman}, title = {On permutations in bipartite graphs}, journal = {Kragujevac Journal of Mathematics}, pages = {57 - 66}, publisher = {mathdoc}, volume = {22}, number = {1}, year = {2000}, zbl = {1010.05075}, url = {http://geodesic.mathdoc.fr/item/KJM_2000_22_1_a6/} }
Ivan Gutman. On permutations in bipartite graphs. Kragujevac Journal of Mathematics, Tome 22 (2000) no. 1. http://geodesic.mathdoc.fr/item/KJM_2000_22_1_a6/