Rayakorn Nokkaew, Vittaya Punsuvon, Tetsuya Inagaki and Satoru Tsuchikawa (2019) “DETERMINATION OF CAROTENOIDS AND DOBI CONTENT IN CRUDE PALM OIL BY SPECTROSCOPY TECHNIQUES: COMPARISON OF RAMAN AND FT-NIR SPECTROSCOPY”, GEOMATE Journal, 16(55), pp. 92–98. Available at: https://geomatejournal.com/geomate/article/view/2485 (Accessed: 10 October 2025).