Nyoro, F. D., S. F. Sim, and A. L. Jeffrey Kimura. “Estimation of Caffeine Content in Coffee of Malaysian Market Using Fourier Transform Infrared (FTIR) Spectroscopy”. Trends in Undergraduate Research, Vol. 1, no. 1, Dec. 2018, pp. a16-22, doi:10.33736/tur.1137.2018.