1. “Extremal results and configuration theorems for Steiner systems”;Cameron;Ann. Discrete Math.,1980
2. “Some new 5-designs”;Denniston;Bull. London Math. Soc.,1976
3. “S-cyclic Steiner systems”;Grannell;Ars Combinatoria,1983
4. “A class of 3-designs”;Hanani,1978
5. H. Hanani, Technion preprint (earlier version of [4]).