@article{10_37236_1653,
     author = {Michael O. Albertson and Joan P. Hutchinson},
     title = {Graph color extensions: {When} {Hadwiger's} conjecture and embeddings help},
     journal = {The electronic journal of combinatorics},
     year = {2002},
     volume = {9},
     doi = {10.37236/1653},
     zbl = {1005.05017},
     url = {http://geodesic.mathdoc.fr/articles/10.37236/1653/}
}