Panishkan, Kamolchanok, Natdhera Sanmanee, and Sirikanlaya Pramual. “Principal Component-Based Modeling Approaches for Predicting Soil Organic Matter”. Thailand Statistician 9, no. 1 (May 28, 2015): 51–64. Accessed April 28, 2024. https://ph02.tci-thaijo.org/index.php/thaistat/article/view/34287.