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2. Beringia as a glacial refugium for boreal trees and shrubs: new perspective from mapped pollen data;Brubaker;J. Biogeogr,2005
3. Atypical cone and leaf character states in Pinus mugo Turra, P. sylvestris L., and P.×rhaetica Brügger (Pinaceae);Christensen;Gleditschia,1987
4. Klit-fyr (Pinus contorta) i Danmark - variation og tilpasning. Lodgepole pine (Pinus contorta) in Denmark - variation and acclimation;Christensen;Dansk Dendrol. Føren,2003
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