Iványi, Antal M., and A. N. Sotnikov. “On the Optimization of Library Information Retrieval Systems”. Acta Cybernetica 7, no. 3 (January 1, 1986): 323-328. Accessed May 6, 2024. https://cyber.bibl.u-szeged.hu/index.php/actcybern/article/view/3300.