Synthetic drugs transmission: stability analysis and optimal control. Letters in Biomathematics, [S. l.], v. 6, n. 2, p. 1–31, 2019. DOI: 10.30707/LiB6.2Saha. Disponível em: https://lettersinbiomath.org/manuscript/index.php/lib/article/view/106.. Acesso em: 21 nov. 2024.