@article {1470, title = {Chemical composition and decomposition of silver birch leaf litter produced under elevated CO2 and O3.}, journal = {Plant and Soil}, volume = {282}, year = {2006}, pages = {261-280}, author = {Kasurinen, A. and Riikonen, J. and Oksanen, E. and Vapaavuori, E. and Holopainen, T.} }