Chien, Jui-Pi. “Schema As Both the Key to and the Puzzle of Life: Reflections on the Uexküllian Crux”. Sign Systems Studies 32, no. 1/2 (December 31, 2004): 188–208. Accessed May 3, 2024. https://ojs.utlib.ee/index.php/sss/article/view/SSS.2004.32.1-2.08.