SHEIKH, Ragaa El; GOUDA, Ayman A.; MAHFOUZ, Lameess I. SPECTROPHOTOMETRIC DETERMINATION OF OXYBUTININE HYDROCHLORIDE BY ION-PAIR EXTRACTIONIN IN PHARMACEUTICAL PREPARATIONS. International Journal of Pharmacy and Pharmaceutical Sciences, [S. l.], v. 7, n. 6, p. 272–277, 2015. Disponível em: https://www.journals.innovareacademics.in/index.php/ijpps/article/view/5653. Acesso em: 6 dec. 2025.