Marcus, Solomon. “Conway’s Game of Life and the Ecosystem Represented by Uexküll’s Concept of Umwelt”. Sign Systems Studies 29, no. 1 (December 31, 2001): 63-69. Accessed January 29, 2022. https://ojs.utlib.ee/index.php/sss/article/view/SSS.2001.29.1.05.