@article{GDZPPN00207558X, title = {Packing of 18 Equal Circles on a Sphere.}, journal = {Elemente der Mathematik}, volume = {20}, year = {1965}, pages = {59-61}, zbl = {0129.37502}, url = {http://dml.mathdoc.fr/item/GDZPPN00207558X} }
Goldberg, Michael. Packing of 18 Equal Circles on a Sphere.. Elemente der Mathematik, Tome 20 (1965) pp. 59-61. http://gdmltest.u-ga.fr/item/GDZPPN00207558X/