B. De la Roza-Delgado, S. Modroño, F. Vicente, A. Martínez-Fernández, and A. Soldado, “Suitability of faecal near-infrared reflectance spectroscopy (NIRS) predictions for estimating gross calorific value”, Span. j. agric. res., vol. 13, no. 1, p. e0203, Feb. 2015.