1. Lecture Notes in Pure and Applied Math.;E.F. Assmus Jr.,1983
2. Assmus, E.F., Jr. and Key, J.D. 1992.Designs and their Codes Cambridge Tracts in Mathematics, 103. Cambridge University Press.
3. Beth, Th., Jungnickel, D., and Lenz, H. 1985.Design Theory. Mannehim, Wien, Zürich: Bibliographisches Institut Wissenschaftsverlag.
4. Cannon, J.Cayley: A Language for Group Theory. Department of Mathematics, University of Sydney, July 1982.
5. Dehon, M., 1980. Ranks of incidence matrices oft-designsS ?(t, t+1, ?)European J. Combin., 1:97?100.