KULL, Kalevi; SALUPERE, Silvi. Ivar Kull, a logician in Tartu semiotics (and on the mathematical side in Tartu semiotics of the 1960s). Sign Systems Studies, [S. l.], v. 54, n. 1-2, p. 147–154, 2026. DOI: 10.12697/SSS.2026.54.1-2.08. Disponível em: https://ojs.utlib.ee/index.php/sss/article/view/29736. Acesso em: 22 oct. 2026.