Development and validation of UV spectrophotometric method for estimation of regioisomeric impurity in Felodipine bulk and formulation. International Journal of Pharmaceutical Chemistry, [S. l.], v. 5, n. 4, p. 128–133, 2015. DOI: 10.7439/ijpc.v5i4.1924. Disponível em: https://www.ssjournals.co.in/index.php/ijpc/article/view/1924. Acesso em: 17 mar. 2026.