@article{GDZPPN002346265,
title = {On a Coloring Problem.},
journal = {Mathematica Scandinavica},
volume = {8},
year = {1960},
pages = {181-188},
zbl = {0095.17002},
url = {http://dml.mathdoc.fr/item/GDZPPN002346265}
}
Grünbaum, B.; Asplund, E. On a Coloring Problem.. Mathematica Scandinavica, Tome 8 (1960) pp. 181-188. http://gdmltest.u-ga.fr/item/GDZPPN002346265/