1. P. Cameron, Projective and polar spaces, QMW Math. Notes, Vol. 13, University of London, London, 1992.
2. Association schemes and t-designs in regular semi-lattice;Delsarte;J. Combin. Theory Ser. A,1976
3. A.G. D'yachkov, A.J. Macula, P.A. Vilenkin, Nonadaptive group testing with error-correction de-disjunct inclusion matrices, preprint.
4. Superimposed distance codes;D'yachkov;Probl. Control Inform. Theory,1989
5. A characterization of the association schemes of bilinear forms;Huang;European J. Combin.,1987