Arctic and boreal ecosystems of western North America as components of the climate systemF. Stuart Chapin, Steven W. Running, A. D. McGuire et al.|Global Change Biology|2000Cited by 634
Steppe-Tundra Transition: A Herbivore-Driven Biome Shift at the End of the PleistoceneS. A. Zimov, M. C. Chapin, James F. Reynolds et al.|The American Naturalist|1995Cited by 483