Chang, Han-liang. “Is Language a Primary Modeling System? On Juri Lotman’s Concept of Semiosphere”. Sign Systems Studies 31, no. 1 (December 31, 2003): 9–23. Accessed April 3, 2025. https://ojs.utlib.ee/index.php/sss/article/view/SSS.2003.31.1.01.