References
- French , R. A. Proceedings of the N.Z. Grassland Association . Vol. 37 , pp. 138 – 142 .
- Rickard , D. S. 1968 . Winchmore Irrigation Research Station Technical Report Number , 2
- Vartha , E. W. Proceedings of the N.Z. Grassland Association . Vol. 34 , pp. 177 – 184 .