@article{GDZPPN002207303,
title = {Landau's theorem for p-blocks of p-solvable groups.},
journal = {Journal f\"ur die reine und angewandte Mathematik},
volume = {405},
year = {1990},
pages = {189-191},
zbl = {0684.20007},
url = {http://dml.mathdoc.fr/item/GDZPPN002207303}
}
Külshammer, Burkhard. Landau's theorem for p-blocks of p-solvable groups.. Journal für die reine und angewandte Mathematik, Tome 405 (1990) pp. 189-191. http://gdmltest.u-ga.fr/item/GDZPPN002207303/