1. Simmetričeskije algebry i sistemy Štejnera Dokl.;Aliev;Akad. Nauk SSR,1967
2. English translation: Symmetric algebras and Steiner systems;Soviet Math. Dokl.,1967
3. Bussemaker, F.C. & Seidel, J.J., Symmetric Hadamard matrices of order 36, T.H.-Report 70-WSK-02, Dept. of Mathematics Tech. University Eindhoven, Netherlands (1970)
4. Extensions of designs: Variations on a theme;Cameron,1977
5. Complete classification of triad systems on 15 elements;Cole;Mem. Nat. Acad. Sci.,1925