Spectrophotometric determination of Procaine penicillin in pure and pharmaceutical formulations using metol. Baghdad Science Journal, Iraq, Baghdad, v. 5, n. 1, p. 137–142, 2008. DOI: 10.21123/bsj.2008.5.1.137-142. Disponível em: https://bsj-ojs.uobaghdad.edu.iq/index.php/BSJ/article/view/876.. Acesso em: 19 jun. 2025.