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Palmer, G.H., Koprowski, J.L., and Pernas, T. 2007. Tree squirrels as invasivespecies: conservation and management implications.InManaging Verte-brate Invasive Species: Proceedings of the USDA National Wildlife ResearchCenter International Symposium, Fort Collins, Colo., 7–9 August 2007.Edited byG.W. Witmer, W.C. Pitt, and K.A. Fagerstone. USDA/APHIS Wildlife Services.pp. 273–282