@article{GDZPPN002283212,
title = {Das Problem der 13 Kugeln.},
journal = {Mathematische Annalen},
volume = {125},
year = {1952},
pages = {325-334},
zbl = {0050.16701},
url = {http://dml.mathdoc.fr/item/GDZPPN002283212}
}
Waerden van der, B.L.; Schütte, K. Das Problem der 13 Kugeln.. Mathematische Annalen, Tome 125 (1952) pp. 325-334. http://gdmltest.u-ga.fr/item/GDZPPN002283212/