Smith, George F., and Niki Stephanie Nicholas. "Size- and Age-Class Distributions of Fraser Fir Following Balsam Woolly Adelgid Infestation." Canadian Journal of Forest Research 30, no. 6 (2000): 948-957.

Smith, George F., and Niki Stephanie Nicholas. "Patterns of Overstory Composition in the FIr and Fir-Spruce Forests of the Great Smoky Mountains After Balsam Woolly Adelgid Infestation." The American Midland Naturalist 139, no. 2 (1998): 340-352.

Smith, George F., and Niki Stephanie Nicholas. Regeneration of Fraser Fir After Thirty Years of Balsam Woolly Adelgid Infestation. Great Smoky Mountains National Park, 1995.