Ratio - First Order Derivative - Zero Crossing UV-Visible Spectrophotometric Method for Analysis of Amoxicillin, Levofloxacin and Lansoprazole Mixture. Pakistan Journal of Analytical & Environmental Chemistry, Pakistan, v. 21, n. 1, p. 34 – 43, 2020. DOI: 10.21743/pjaec/2020.06.05. Disponível em: http://pjaec.pk/index.php/pjaec/article/view/120. Acesso em: 12 jul. 2025.