OPTIMISATION AND VALIDATION OF HPLC METHOD FOR SIMULTANEOUS QUANTIFICATION OF RIFAMPICIN, ISONIAZID, PYRAZINAMIDE, AND ETHAMBUTOL HYDROCHLORIDE IN ANTI-TUBERCULOSIS 4-FDC TABLET. JT [Internet]. 2015 Oct. 21 [cited 2024 May 7];77(1). Available from: https://journals.utm.my/jurnalteknologi/article/view/3870