Estimation of the biomass stock of trees in Sweden: comparison of biomass equations and age-dependent biomass expansion factors Anneli Jalkanen, Raisa Mäkipää, Göran Ståhl, Aleksi Lehtonen and Hans PeterssonAnn. For. Sci., 62 8 (2005) 845-851DOI: https://doi.org/10.1051/forest:2005075