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2. D. Aranda (private communication)
3. L. Ohlander, Swedish University of Agriculture (private communication)
4. P.O. Nilsson, Biomass flows in Swedish forestry 2004, Swedish Forest Agency, Report 23 (2006) (in Swedish)
5. P. Jarvis, S. Linder, Constraints to growth of boreal forests, Nature 405 (2000)