@article{KJM_2000_22_a6,
     author = {Ivan Gutman},
     title = {On permutations in bipartite graphs},
     journal = {Kragujevac Journal of Mathematics},
     pages = {57 },
     publisher = {mathdoc},
     volume = {22},
     year = {2000},
     zbl = {1010.05075},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/KJM_2000_22_a6/}
}