Csuhaj-Varjú, Erzsébet, and Zoltán Ésik. “Preface”. Acta Cybernetica 19, no. 2 (January 1, 2009): 441-443. Accessed November 22, 2024. https://cyber.bibl.u-szeged.hu/index.php/actcybern/article/view/3775.