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Wang, J.R., Hawkins, C.D.B. and Letchford, T. (1998) Photosynthesis, Water, and Nitrogen Use Efficiencies of Four Paper Birch (Betula papyrifera) Populations Grown under Different Soil Moisture and Nutrient Regimes. Forest Ecology and Management, 112, 233-244.
http://dx.doi.org/10.1016/S0378-1127(98)00407-1

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