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Wangia, C. , Orwa, J. , Muregi, F. , Kareru, P. , Cheruiyot, K. , Guantai, E.. "Quantitative and Fourier Transform Infrared Analysis of Saponins from Three Kenyan Ruellia Species: Ruellia prostrata, Ruellia lineari-bracteolata and Ruellia bignoniiflora ". World Academy of Science, Engineering and Technology, Open Science Index 138, International Journal of Biological and Ecological Engineering (2018), 12(6), 155 - 159.