Ponzio, Augusto, and Susan Petrilli. “Bioethics, Semiotics of Life, and Global Communication”. Sign Systems Studies 29, no. 1 (December 31, 2001): 263–275. Accessed May 18, 2024. https://ojs.utlib.ee/index.php/sss/article/view/SSS.2001.29.1.16.