Bibliografi:Marklund1988
Marklund, Lars Gunnar (1988). Biomass functions pine, spruce and birch in Sweden. Report 45. Department of Forest Survey. Swedish University of Agricultural Sciences. ISBN 91-576-3524-2
Marklund, Lars Gunnar (1988). Biomass functions pine, spruce and birch in Sweden. Report 45. Department of Forest Survey. Swedish University of Agricultural Sciences. ISBN 91-576-3524-2