J. O.  Kaplan, Bigelow, N. H., Prentice, I. C., Harrison, S. P., Bartlein, P. J., Christensen, T. R., Cramer, W., Matveyeva, N. V., McGuire, A. D., and Murray, D. F., ?Climate change and Arctic ecosystems: 2. Modeling, paleodata-model comparisons, and future projections?, J. Geophys. Res, vol. 108, p. 8171, 2003.