1. “Symmetric Hadamard matrices of order 36”;Bussemaker,1970
2. “Complete classification of the triad systems on fifteen elements”;Cole;Memoirs of the National Academy of Sciences U.S.A.,1919
3. “Computing techniques for the construction and analysis of block designs”;Gibbons,1976
4. “Determination of Steiner triple systems of order 15”;Hall;Mathematical Tables and Other Aids to Computation,1955
5. “Protective embeddings of small Steiner triple systems”;Limbos;Annals of Discrete Mathematics,1980