Derivative spectrophotometric method for the determination of binary mixture of metoprolol tartrate and hydrochlorothiazide - García, Verenith Vega; Deus, Fábia Soares Nicolini de; Oliveira, Claudia Vilela de; García, Pedro López; Galdos, Angel Arturo Gaona; Kedor-Hackmann, Erika Rosa Maria; Santoro, Maria Inês Rocha Miritello; Aurora-Prado, Maria Segunda (International Symposium on Pharmaceutical and Biomedical Analysis, 2011)