1. K. T.Arasu, Quotient Sets, homomorphic images and multipliers. Ph.D. Dissertation, Ohio State University 1983.
2. K. T. Arasu, (81, 16, 3) Abelian difference sets do not exist. J. Combin. Theory (A) (2)43, 350?353 (1986).
3. K. T. Arasu andD. K. Ray-Chaudhuri, Multiplier Theorem for a difference List. Ars. Combin.22, 119?137 (1986).
4. K. T.Arasu and J.Reis, On abelian groups of order 64 that have difference sets. Unpublished technical report, wright state University Report # 1987.
5. Th. Beth, D. Jungnickel andH. Lenz, Design Theory. Bibliographisches Institut Mannheim-Wien-Zürich 1985, Cambridge University Press, Cambridge 1986.