@article{MAN_1952__125_160314,
     author = {B.L. Waerden van der and K. Sch\"utte},
     title = {Das {Problem} der 13 {Kugeln.}},
     journal = {Mathematische Annalen},
     pages = {325--334},
     publisher = {mathdoc},
     volume = {125},
     year = {1952},
     zbl = {0050.16701},
     url = {http://geodesic.mathdoc.fr/item/MAN_1952__125_160314/}
}