1. Full convex l-subgroups of a lattice-ordered group;Ball,1974
2. Normal subgroups of doubly transitive automorphism groups of chains;Ball;Trans. Amer. Math. Soc.,1985
3. Wechselwirkung der algebraischen Struktur transitiver Automorphismengruppen mit der Geometrie ihres Operationsbereiches;Droste,1982
4. The normal subgroup lattice of 2-transitive automorphism groups of linearly ordered sets;Droste;Order,1985
5. A construction of all normal subgroup lattices of 2-transitive automorphism groups of linearly ordered sets;Droste;Israel J. Math.,1985