OPTIMISATION AND VALIDATION OF HPLC METHOD FOR SIMULTANEOUS QUANTIFICATION OF RIFAMPICIN, ISONIAZID, PYRAZINAMIDE, AND ETHAMBUTOL HYDROCHLORIDE IN ANTI-TUBERCULOSIS 4-FDC TABLET. J. Teknol. [Internet]. 2015 Oct. 21 [cited 2026 Sep. 13];77(1). Available from: https://journals.utm.my/jurnalteknologi/article/view/3870