@article{GDZPPN00207527X, title = {Packing of 33 equal Circles on a Sphere.}, journal = {Elemente der Mathematik}, volume = {18}, year = {1963}, pages = {99-100}, zbl = {0112.37502}, url = {http://dml.mathdoc.fr/item/GDZPPN00207527X} }
Goldberg, M. Packing of 33 equal Circles on a Sphere.. Elemente der Mathematik, Tome 18 (1963) pp. 99-100. http://gdmltest.u-ga.fr/item/GDZPPN00207527X/