Bachri, Muchlisyam, Masfria Masfria, Syahputra Syahputra, and Hafid Hafid. 2019. “Quantitative Estimation of Anti Hypertension Combination by Ratio Subtraction Spectrophotometry Method”. Open Access Macedonian Journal of Medical Sciences 7 (17):2940-46. https://doi.org/10.3889/oamjms.2019.750.