1. Existence of nilpotent SQS-skeins of class n;Armanious;Ars Combinatoria,1990
2. Classification of the Steiner quadruple systems of cardinality 32;Armanious;Beitrage zur Algebra und Geometrie,1989
3. Commutator theory for congruence Modular Varieties;Freese,1987
4. Co-ordinating Steiner systems;Ganter;Ann. Discrete Math.,1980
5. Semi-boolean SQS-skeins;Guelzow;J. Algebraic Combin.,1993