Bachri, M., Masfria, M., Syahputra, S. and Hafid, H. (2019) “Quantitative Estimation of Anti Hypertension Combination by Ratio Subtraction Spectrophotometry Method”, Open Access Macedonian Journal of Medical Sciences, 7(17), pp. 2940–2946. doi: 10.3889/oamjms.2019.750.