Aszalós, László, and Tamás Herendi. “Density of Tautologies in Logics With One Variable”. Acta Cybernetica 20, no. 3 (January 1, 2012): 385-398. Accessed November 23, 2024. https://cyber.bibl.u-szeged.hu/index.php/actcybern/article/view/3818.