TREFIL, J. How long would evidence of an extraterrestrial visit survive: An educational exercise . Macedonian Journal of Chemistry and Chemical Engineering, [S. l.], v. 41, n. 1, p. 129–132, 2022. DOI: 10.20450/mjcce.2022.2502. Disponível em: https://mjcce.org.mk/index.php/MJCCE/article/view/2502. Acesso em: 29 sep. 2022.