I. Saputra, I. Jaswir, and R. Akmeliawati, “Identification of Pig Adulterant in Mixture of Fat Samples and Selected Foods based on FTIR-PCA Wavelength Biomarker Profile”, Int. J. Adv. Sci. Eng. Inf. Technol., vol. 8, no. 6, pp. 2341–2348, Dec. 2018.