Lütolf, Christine; Margot, François - In: Mathematical Methods of Operations Research 47 (1998) 2, pp. 221-241
This paper describes a backtracking algorithm for the enumeration of nonisomorphic minimally nonideal (n ×n) matrices that are not degenerate projective planes. The application of this algorithm forn ≤ 12 yielded 20 such matrices, adding 5 matrices to the 15 previously known. For greater...