M. Arago, N., J. W. F. Orillo, J. Jerlin Haban, J. Juan, J. C. Puno, J. F. Quijano, and G. M. Tuazon. “SoilMATe: Soil Macronutrients and PH Level Assessment for Rice Plant through Digital Image Processing Using Artificial Neural Network”. Journal of Telecommunication, Electronic and Computer Engineering (JTEC), vol. 9, no. 2-5, June 2017, pp. 145-9, https://jtec.utem.edu.my/jtec/article/view/2415.