1. Graph Theory, Coding Theory and Block Designs;Cameron,1975
2. Extending symmetric designs;Cameron;J. Combin. Theory (A),1973
3. W. Haemers, Personal communication.
4. Strongly regular graphs derived from combinatorial designs;Goethals;Canad. J. Math.,1970
5. Strongly regular graphs and quasi-symmetric designs;Shrikhande;Utilitas Math.,1973