Sonesson, Göran. “The Meaning of Meaning in Biology and Cognitive Science: A Semiotic Reconstruction”. Sign Systems Studies 34, no. 1 (December 31, 2006): 135–213. Accessed April 20, 2024. https://ojs.utlib.ee/index.php/sss/article/view/SSS.2006.34.1.07.