Existence Status of Some Previously Open Abelian Difference Sets.

K. T. Arasu Grady Burkett Michael Linger Existence Status of Some Previously Open Abelian Difference Sets. 26 2003 15 Electronic Notes in Discrete Mathematics http://dx.doi.org/10.1016/S1571-0653(04)00514-1 db/journals/endm/endm15.html#ArasuBL03