, Terry V. Callaghan, Sven Jonasson, Differential Growth Responses of Cassiope tetragona, an Arctic Dwarf-Shrub, to Environmental Perturbations among Three Contrasting High- and Subarctic Sites, Oikos, Vol. 66, No. 3 (Apr., 1993), pp. 389-402
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Havström et al. (1993) studied this question.