References
- Büsgen , M. , Münch , E. and Thomson , T. 1929 . The Structure and Life of Forest Trees , London : Chapman & Hall .
- le Roux , H. H. 1955 . Wind Damage to Pinus patula . J. S.A. For. Assoc. , No. 26
- Nänni , U. W. 1956 . Hydrological Research at the Cathedral Peak Research Station . J. S.A. For. Assoc. , No. 27