@article{DMGT_1995_15_2_a7,
     author = {Hartnell, Bert and Rall, Douglas},
     title = {Vizing's conjecture and the one-half argument},
     journal = {Discussiones Mathematicae. Graph Theory},
     pages = {205--216},
     publisher = {mathdoc},
     volume = {15},
     number = {2},
     year = {1995},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/DMGT_1995_15_2_a7/}
}