@article{1102947534, author = {Hillel, J.}, title = {On the number of type-$k$ translation-invariant groups.}, journal = {Pacific J. Math.}, volume = {49}, number = {2}, year = {1973}, pages = { 539-541}, language = {en}, url = {http://dml.mathdoc.fr/item/1102947534} }
Hillel, J. On the number of type-$k$ translation-invariant groups.. Pacific J. Math., Tome 49 (1973) no. 2, pp. 539-541. http://gdmltest.u-ga.fr/item/1102947534/