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@article{MAN_1968__178_161741, author = {W. MADER}, title = {Homomorphies\"atze f\"ur {Graphen.}}, journal = {Mathematische Annalen}, pages = {154--168}, publisher = {mathdoc}, volume = {178}, year = {1968}, zbl = {0165.57401}, url = {http://geodesic.mathdoc.fr/item/MAN_1968__178_161741/} }
W. MADER. Homomorphiesätze für Graphen.. Mathematische Annalen, Tome 178 (1968), pp. 154-168. http://geodesic.mathdoc.fr/item/MAN_1968__178_161741/