Voir la notice de l'article provenant de la source European Digital Mathematics Library
@article{MAN_1960__141_160797, author = {K. Wagner}, title = {Faktorklassen in {Graphen.}}, journal = {Mathematische Annalen}, pages = {49--67}, publisher = {mathdoc}, volume = {141}, year = {1960}, zbl = {0091.37603}, url = {http://geodesic.mathdoc.fr/item/MAN_1960__141_160797/} }
K. Wagner. Faktorklassen in Graphen.. Mathematische Annalen, Tome 141 (1960), pp. 49-67. http://geodesic.mathdoc.fr/item/MAN_1960__141_160797/