@article{10_37236_272,
     author = {Dhruv Mubayi and Sundar Vishwanathan},
     title = {Bipartite coverings and the chromatic number},
     journal = {The electronic journal of combinatorics},
     year = {2009},
     volume = {16},
     number = {1},
     doi = {10.37236/272},
     zbl = {1186.05099},
     url = {http://geodesic.mathdoc.fr/articles/10.37236/272/}
}