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J.-D. Bucyanayandi, J.-M. Bergeron, J. Soucie, D. W. Thomas, Y. Jean, Differences in Nutritional Quality Between Herbaceous Plants and Bark of Conifers as Winter Food for the Vole Microtus pennsylvanicus, Journal of Applied Ecology, Vol. 29, No. 2 (1992), pp. 371-377
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Bucyanayandi et al. (1992) studied this question.
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