Kuba, Attila. “Determination of the Structure of the Class A(R, S) of (0, L)-Matrices”. Acta Cybernetica 9, no. 2 (January 1, 1989): 121-132. Accessed May 6, 2024. https://cyber.bibl.u-szeged.hu/index.php/actcybern/article/view/3360.