1. Théorie des Graphes et ses Applications;Berge,1958
2. Construction of disjoint Steiner triple systems;Doyen,1972
3. Combinatorial Theory;Hall,1967
4. H.S.Schreiber, Some mappings of periodic groups, to appear in the Israel J. Math.
5. S. Schreiber, Some balanced complete blocks designs, submitted to the Israel J. Math.