On the finite simple groups
Endliche Gruppen mit lauter nilpotenten zweitmaximalen Untergruppen.
Finite groups with invariant fourth maximal subgroups.
Finite simple groups with short chains of subgroups.
On Finite Simple Groups whose Sylow 2-Subgroups have no Normal Elementary Subgroups of Order 8.
On Projective Planes of Order Twelve and Twenty.
Projective planes of order 12 do not have a non-abelian group of order 6 as a collineation group.
Projective planes of order 10 do not have a collineation of order 3.
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