@article{1103036718, author = {Hill, Paul}, title = {On the number of pure subgroups.}, journal = {Pacific J. Math.}, volume = {12}, number = {4}, year = {1962}, pages = { 203-205}, language = {en}, url = {http://dml.mathdoc.fr/item/1103036718} }
Hill, Paul. On the number of pure subgroups.. Pacific J. Math., Tome 12 (1962) no. 4, pp. 203-205. http://gdmltest.u-ga.fr/item/1103036718/