@article{1256052511, author = {Gorenstein, Daniel and Walter, John H.}, title = {The $\pi$-layer of a finite group}, journal = {Illinois J. Math.}, volume = {15}, number = {4}, year = {1971}, pages = { 555-564}, language = {en}, url = {http://dml.mathdoc.fr/item/1256052511} }
Gorenstein, Daniel; Walter, John H. The $\pi$-layer of a finite group. Illinois J. Math., Tome 15 (1971) no. 4, pp. 555-564. http://gdmltest.u-ga.fr/item/1256052511/