1. Adams, W.T. (1981) Population genetics and gene conservation in Pacific Northwest conifers. In Evolution today, Proc. Intern. Congress. System. Evol. Biol. 2nd., pp. 401?15.
2. Brown, A.H.D. and Clegg, M.T. (1983) Isozyme assessment of plant genetic resources. In Isozymes: Current Topics in Biology and Medical Research, Vol. II. pp. 285?95, New York: Alan R. Liss.
3. Brunel, D. and Rodolphe, F. (1985) Genetic neighbourhood structure in a population of Picea abies L. Theor. Appl. Genet. 71, 101?10.
4. Chaisurisri, K. and El-Kassaby, Y.A. (1993) Genetic control of allozyme variants in Sitka spruce. J. Heredity 84, 206?11.
5. El-Kassaby, Y.A. (1989) Genetics of seed orchards: expectations and realities. In: Proc. of the 20th South. For. Tree Improv. Conf., June 27?29, 1989. Charleston, South Carolina. pp. 87?109.