Intelligent Spectroscopy System Used for Physicochemical Variables Estimation in Sugar Cane Soils. - Ofelia Landeta-Escamilla; Oscar Osvaldo Sandoval-Gonzalez; Albino Martínez-Sibaja; José de Jesús Agustín Flores-Cuautle; Rubén Posada-Gómez; Alejandro Alvarado-Lassman (Sensors, 2019)