G.S. Duggal, N.B. Okelo, Generalised Sum Construction of Automorphic Bibds and their Applications in Experimental Designs and Technology, ETET Volume 3, Evolving Trends in Engineering and Technology (Volume 3)
    We give more constructions equivalent to “sum construction “, of BIBDs where BIBD is added to a BIBD that is automorphic to it is presented. Moreover we present their applications in technology