Villamuelas, Miriam Predicting herbivore faecal nitrogen using a multispecies near-infrared reflectance spectroscopy calibration. [electronic resource] - PloS one 2017 - e0176635 p. digital Publication Type: Journal Article ISSN: 1932-6203 Standard No.: 10.1371/journal.pone.0176635 doi Subjects--Topical Terms: AnimalsCalibrationFeces--chemistryHerbivoryNitrogen--analysisSpectroscopy, Near-Infrared--methods