CARBON ACCUMULATION IN EUROPEAN FORESTS Article Valentini R., Ciais P., Schelhaas M.J., Zaehle S., Piao S.L., Cescatti A., Liski J., Luyssaert S., Le-Maire G., Schulze E.-D., Bouriaud O., Freibauer A., Nabuurs G.J. NATURE GEOSCIENCE. Nature Publishing Group. Vol. 1. 2008. P. 425-429