Malcolm, B. J., P. L. Carey, E. I. Teixeira, P. R. Johnstone, S. C. Maley, and J. M. de Ruiter. “Potential of Catch Crops to Reduce Nitrogen Leaching in New Zealand Winter Grazing Systems”. Journal of New Zealand Grasslands, vol. 80, Dec. 2018, pp. 207-14, doi:10.33584/jnzg.2018.80.331.