Quin, B.; Gillingham, A.; Baird, D.; Spilsbury, S.; Gray, M. A Comparison under Grazing of Pasture Production, Pasture N Content and Soil Mineral N Levels Between Granular Urea and ONEsystem® on Two Contrasting Dairy Farms in New Zealand. Journal of NZ Grasslands 2015, 77, 259-268.