@article{10_37236_1342,
     author = {Michael Krivelevich},
     title = {An improved bound on the minimal number of edges in color-critical graphs},
     journal = {The electronic journal of combinatorics},
     year = {1998},
     volume = {5},
     doi = {10.37236/1342},
     zbl = {0885.05063},
     url = {http://geodesic.mathdoc.fr/articles/10.37236/1342/}
}