Anthony Bonato Wolf H. Holzmann Hadi Kharaghani Hadamard Matrices and Strongly Regular Graphs with the 3-e.c. Adjacency Property. 2001 8 Electr. J. Comb. 1 http://www.combinatorics.org/Volume_8/Abstracts/v8i1r1.html db/journals/combinatorics/combinatorics8.html#BonatoHK01