Voir la notice de l'article provenant de la source Czech Digital Mathematics Library
@article{MASLO_1976__26_2_a9, author = {Zelinka, Bohdan}, title = {The {Hadwiger} number of an infinite graph}, journal = {Mathematica slovaca}, pages = {153--157}, publisher = {mathdoc}, volume = {26}, number = {2}, year = {1976}, mrnumber = {0427146}, zbl = {0326.05105}, language = {en}, url = {http://geodesic.mathdoc.fr/item/MASLO_1976__26_2_a9/} }
Zelinka, Bohdan. The Hadwiger number of an infinite graph. Mathematica slovaca, Tome 26 (1976) no. 2, pp. 153-157. http://geodesic.mathdoc.fr/item/MASLO_1976__26_2_a9/