1. On uniformly packed [n, n - k, 4] codes over GF(q) and a class of caps in PG(k -1, q);Calderbank;J. London Math. Soc.,1982
2. A.R. Calderbank, W.M. Kantor, The geometry of two-weight codes, to appear in Bull. London Math. Soc.
3. P. Delsarte, Two-weight linear codes and strongly regular graphs, Report R 160 (MBLE Research Laboratory Brussels, 1971).
4. An algebraic approach to the association schemes of coding theory;Delsarte;Phillips Research Reports Supplements,1973
5. Association schemes;Goethals,1979