@article{GDZPPN002206765,
title = {Blocks, solvable permutation groups, and Landau's theorem.},
journal = {Journal f\"ur die reine und angewandte Mathematik},
volume = {394},
year = {1989},
pages = {180-186},
zbl = {0666.20003},
url = {http://dml.mathdoc.fr/item/GDZPPN002206765}
}
Külshammer, Burkhard. Blocks, solvable permutation groups, and Landau's theorem.. Journal für die reine und angewandte Mathematik, Tome 394 (1989) pp. 180-186. http://gdmltest.u-ga.fr/item/GDZPPN002206765/