Kull, Kalevi. “Steps towards the Natural Meronomy and Taxonomy of Semiosis: Emon Between Index and Symbol?”. Sign Systems Studies 47, no. 1/2 (January 10, 2024): 88–104. Accessed November 22, 2024. https://ojs.utlib.ee/index.php/sss/article/view/SSS.2019.47.1-2.03.