@article{Thompson_Pfeifer_1993, title={Future options for the genetic improvement of Conifers. Part II: Longer-term technologies.}, url={https://journal.societyofirishforesters.ie/index.php/forestry/article/view/9725}, journal={Irish Forestry}, author={Thompson, D.G. and Pfeifer, A.R.}, year={1993}, month={Nov.}