Authors
V. Bakkestuen
Dept. of Botany, Natural History Museum, University of Oslo, Oslo, Norway
P. Aarrestad
Norwegian Institute for Nature Research, Trondheim, Norway
O. Stabbetorp
Norwegian Institute for Nature Research, Oslo, Norway
L. Erikstad
Norwegian Institute for Nature Research, Oslo, Norway
O. Eilertsen
Norwegian Forest and Landscape Institute, Ås