Constructions are given for generalised Hadamard matrices and weighing matrices with entries from abelian groups. These are then used to construct families of SBIBDs giving alternate proofs to those of Rajkundlia.
History
Citation
Seberry, J, Some remarks on generalised Hadamard matrices and theorems of Rajkundlia on SBIBDs, Combinatorial Mathematics VI, Lecture Notes in vol 748, 1979, 154-164.