1. Quotient Sets, Homomorphic Images, and Multipliers;Arasu,1983
2. K. T. Arasu, and D. K. Ray-Chaudhuri, Multiplier theorem for a list, to appear.
3. Design Theory;Beth,1985
4. Difference sets in a finite group;Bruck;Trans. Amer. Math. Soc.,1955
5. Symmetric Designs: An Algebraic Approach;Lander,1983