Klopfenstein, T.; Angel, R.; Cromwell, G. L.; Erickson, G. E.; Fox, D. G.; Parsons, C.; Satter, L. D.; Sutton, A. L. Animal Diet Modification To Decrease The Potential For Nitrogen And Phosphorus Pollution. CAST Publications 2002. https://doi.org/10.62300/axxcz938.