Markoš, Anton. “In the Quest for Novelty: Kauffman’s Biosphere and Lotman’s Semiosphere”. Sign Systems Studies 32, no. 1/2 (December 31, 2004): 309–327. Accessed April 20, 2024. https://ojs.utlib.ee/index.php/sss/article/view/SSS.2004.32.1-2.14.