@article{GDZPPN002393301, title = {On the normality of Hall subgroups in finite groups.}, journal = {Mathematische Zeitschrift}, volume = {82}, year = {1963}, pages = {243-246}, zbl = {0118.26703}, url = {http://dml.mathdoc.fr/item/GDZPPN002393301} }
Sah, Chih-Han. On the normality of Hall subgroups in finite groups.. Mathematische Zeitschrift, Tome 82 (1963) pp. 243-246. http://gdmltest.u-ga.fr/item/GDZPPN002393301/