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@article{JRAM_1989__398_153149, author = {Burkhard K\"ulshammer}, title = {Blocks, solvable permutation groups, and {Landau's} theorem.}, journal = {Journal f\"ur die reine und angewandte Mathematik}, pages = {180--186}, publisher = {mathdoc}, volume = {398}, year = {1989}, zbl = {0666.20003}, url = {http://geodesic.mathdoc.fr/item/JRAM_1989__398_153149/} }
Burkhard Külshammer. Blocks, solvable permutation groups, and Landau's theorem.. Journal für die reine und angewandte Mathematik, Tome 398 (1989), pp. 180-186. http://geodesic.mathdoc.fr/item/JRAM_1989__398_153149/