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Gas exchange, leaf nitrogen, and growth efficiency of Populus tremuloides in a CO2-enriched atmosphere. Ecological Applications. 10(1):3-17.. 2000.
Genotypic variation in physiological and growth responses of Populus tremuloides to elevated atmospheric CO2 concentration. Tree Physiology. 20:1019-1028.. 2000.
Genotypic variation for condensed tannin production in trembling aspen (Populus tremuloides, Salicaceae) under elevated CO2 and in high- and low-fertility soil. American Journal of Botany. 86(8):1154-1159.. 1999.
Growth and C allocation of Populus tremuloides genotypes in response to atmospheric CO2 and soil N availability. New Phytologist. 140:251-260.. 1998.