Formulation evaluation development and validation of simultaneous equation method for estimation of vitamin C and vitamin D in multivitamin lipstick. Asian Journal of Pharmaceutical and Health Sciences, [S. l.], v. 10, n. 2, p. 2239–2247, 2020. DOI: 10.5530/51w15g59. Disponível em: https://ajphs.com/index.php/ajphs/article/view/204. Acesso em: 23 sep. 2025.