1. Alden, J. and Loopstra, C. 1987. Genetic diversity and population structure of Picea glauca on an altitudinal gradient in interior Alaska. Can. J. For. Res. 17:1519?1526.
2. Beaumont, A. R., Beveridge, C. M. and Budd, M. D. 1983. Selection and heterozygosity within single families of the mussel Mytilus edulis (L.). Mar. Biol. Lett. 4:151?161.
3. Bergmann, F. 1978. The allelic distribution at an acid phosphatase locus in Norway spruce (Picea abies) along similar climatic gradients. Theor. Appl. Genet. 52: 57?64.
4. Bongarten, B. C., Wheeler, N. C. and Jech, K. S. 1985. Isozyme heterozygosity as a selection criterion for yield improvement in Douglas-fir, pp. 121?128. In: Caron, F., Corriveau, A. G. and Boyle, T. J. B. (Eds) Proc. 20th meeting of the Canadian Tree Improvement Assoc., Quebec City, Quebec, Canada, August 19?22, 1985. 2. New ways in forest genetics. Canadian Forestry Service, Ottawa, Canada.
5. Boyle, T. J. B. and Morgenstern, E. K. 1986. Estimates of outcrossing rates in six populations of black spruce in central New Brunswick. Silvae Genet. 35:102?106.