@article{1183529940,
author = {Wilf, Herbert S.},
title = {Hadamard determinants M\"obius functions, and the chromatic number of a graph},
journal = {Bull. Amer. Math. Soc.},
volume = {74},
number = {6},
year = {1968},
pages = { 960-964},
language = {en},
url = {http://dml.mathdoc.fr/item/1183529940}
}
Wilf, Herbert S. Hadamard determinants Möbius functions, and the chromatic number of a graph. Bull. Amer. Math. Soc., Tome 74 (1968) no. 6, pp. 960-964. http://gdmltest.u-ga.fr/item/1183529940/