Kull K, Salupere S. Ivar Kull, a logician in Tartu semiotics (and on the mathematical side in Tartu semiotics of the 1960s). SSS [Internet]. 2026 Aug. 25 [cited 2026 Aug. 25];54(1-2):147-54. Available from: https://ojs.utlib.ee/index.php/sss/article/view/29736