1. Design Theory, vol. I;Beth,1999
2. The CRC Handbook of Combinatorial Designs;Colbourn,2007
3. Concerning difference matrices;Colbourn;Des. Codes Cryptogr.,1996
4. Generalized Hadamard matrices whose rows and columns form a group;de Launey,1983
5. Orthogonal Arrays;Hedayat,1999