1. Automorphisms of Steiner triple systems with holes;Calahan,1990
2. Rotational Steiner triple systems;Cho;Discrete Math.,1982
3. A note on reverse Steiner triple systems;Doyen;Discrete Math.,1972
4. R. Gardner, A note on a class of Steiner triple systems, Ars Combin., to appear.
5. Ueber Triplesysteme;Heffter;Math. Ann.,1897