1. Bridgwater, F. E. and Franklin, E. C. 1985. Forest tree breeding: Strategies, achievements and constraints. In: Attributes of trees as crop plants. (M. G. R. Cannell and J. E. Jackson, eds.), 3648. Institute of Terrestrial Ecology, Great Britain.
2. Burdon, R. D. and Shelbourne, C. J. A. 1971. Breeding populations for recurrent selection: conflicts and possible solutions. N.Z.J. For. Sci., 1:174–193.
3. Byram, T. D., Lowe, W. J. and McKinley, C. R. 1987. Polymix crosses for rust resistance screening. In: Proc. of the 19th S. For. Tree Impr. Conf., College Station, TX, June 16–18, 39–44.
4. Cotterill, P. P. 1984. A plan for breeding radiata pine. Silvae Genetica 33:84–90.
5. Cotterill, P. P. 1989. The nucleus breeding system. In: Proc. of the 20th S. For. Tree Impr. Conf., Charleston, SC. June 26–30, 3642.