PAPINI, A. M. From morphine to endogenous opioid peptides, e.g., endorphins: the endless quest for the perfect painkiller. Substantia, [S. l.], v. 2, n. 2, p. 81–91, 2018. DOI: 10.13128/Substantia-63. Disponível em: https://riviste.fupress.net/index.php/subs/article/view/63. Acesso em: 2 may. 2024.