@article{1103038234, author = {Hobby, Charles}, title = {A characteristic subgroup of a $p$-group.}, journal = {Pacific J. Math.}, volume = {10}, number = {4}, year = {1960}, pages = { 853-858}, language = {en}, url = {http://dml.mathdoc.fr/item/1103038234} }
Hobby, Charles. A characteristic subgroup of a $p$-group.. Pacific J. Math., Tome 10 (1960) no. 4, pp. 853-858. http://gdmltest.u-ga.fr/item/1103038234/