ULVESTAD, E. Biosemiotic knowledge — a prerequisite for valid explorations of extraterrestrial intelligent life . Sign Systems Studies, [S. l.], v. 30, n. 1, p. 283–292, 2002. DOI: 10.12697/SSS.2002.30.1.18. Disponível em: https://ojs.utlib.ee/index.php/sss/article/view/SSS.2002.30.1.18. Acesso em: 23 apr. 2024.