KULL, K. Ladder, tree, web: The ages of biological understanding. Sign Systems Studies, [S. l.], v. 31, n. 2, p. 589–603, 2003. DOI: 10.12697/SSS.2003.31.2.15. Disponível em: https://ojs.utlib.ee/index.php/sss/article/view/SSS.2003.31.2.15. Acesso em: 29 mar. 2024.