Wąsik, Zdzisław. “On the Biological Concept of Subjective Significance: A Link Between the Semiotics of Nature and the Semiotics of Culture”. Sign Systems Studies 29, no. 1 (December 31, 2001): 83–106. Accessed April 27, 2024. https://ojs.utlib.ee/index.php/sss/article/view/SSS.2001.29.1.07.