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)
https://www.scipress.com/ETET.3.19
Abstract:
    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
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