@article{GDZPPN002288613,
title = {Faktorklassen in Graphen.},
journal = {Mathematische Annalen},
volume = {141},
year = {1960},
pages = {49-67},
zbl = {0091.37603},
url = {http://dml.mathdoc.fr/item/GDZPPN002288613}
}
Wagner, K. Faktorklassen in Graphen.. Mathematische Annalen, Tome 141 (1960) pp. 49-67. http://gdmltest.u-ga.fr/item/GDZPPN002288613/