Petcharaporn, K. , Kumchoo, S. (2014), 'Calibration Model of %Titratable Acidity (Citric Acid) for Intact Tomato by Transmittance SW-NIR Spectroscopy', World Academy of Science, Engineering and Technology, Open Science Index 92, International Journal of Agricultural and Biosystems Engineering, 8(8), 825 - 828.