Gus Shaver

Global change and arctic ecosystems: is lichen decline a function of increases in vascular plant biomass?

Terry V. Callaghan, Juha M. Alatalo, Ulf Molau, 2001 .

Arctic tundra and Polar Desert Ecosystems

Brian Huntley, Terry V. Callaghan, Margareta Johansson, 2005 .