Douglas, G.B., A.D. Mackay, M.B. Dodd, C.M. Lloyd-West, and R.A.J. Gray. 2015. “Factors Determining Shrub Abundance on Uncultivable Hill Country”. Journal of New Zealand Grasslands 77 (January):239-44. https://doi.org/10.33584/jnzg.2015.77.454.