@article{GDZPPN002218569,
title = {Die chromatischen polynome Unterringfreier Graphen.},
journal = {Manuscripta mathematica},
volume = {12},
year = {1974},
pages = {223-234},
zbl = {0293.05113},
url = {http://dml.mathdoc.fr/item/GDZPPN002218569}
}
Braun, K.; Kretz, M.; Walter, B. Die chromatischen polynome Unterringfreier Graphen.. Manuscripta mathematica, Tome 12 (1974) pp. 223-234. http://gdmltest.u-ga.fr/item/GDZPPN002218569/