Bert Hartnell, Douglas F. Rall. Vizing's conjecture and the one-half argument. Discussiones Mathematicae Graph Theory, 15(2):205-216, 1995. [doi]
@article{HartnellR95,
title = {Vizing's conjecture and the one-half argument},
author = {Bert Hartnell and Douglas F. Rall},
year = {1995},
doi = {10.7151/dmgt.1018},
url = {http://dx.doi.org/10.7151/dmgt.1018},
researchr = {https://researchr.org/publication/HartnellR95},
cites = {0},
citedby = {0},
journal = {Discussiones Mathematicae Graph Theory},
volume = {15},
number = {2},
pages = {205-216},
}