Djuuna, I. A. F., L. Abbott, and C. Russell. “Determination and Prediction of Some Soil Properties Using Partial Least Square (PLS) Calibration and Mid-Infra Red (MIR) Spectroscopy Analysis”. JOURNAL OF TROPICAL SOILS, vol. 16, no. 2, July 2013, pp. 93-98, doi:10.5400/jts.2011.v16i2.93-98.