Supported by the National Natural Science Foundation of China(No.10561002);Guangxi Science Foundation(No.0640062);Innovation Project of Guangxi Graduate Education.
A (v, k, λ) difference family ((v, k, λ)-DF in short) over an abelian group G of order v, is a collection F=(Bi|i ∈ I} of k-subsets of G, called base blocks, such that any nonzero element of G can be repres...