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2. Regression Diagnostics: Identifying Influential Data and Sources of Collinearity;Belsley,1980
3. Golden marmot alarm calls. I. The production of situationally specific vocalizations;Blumstein;Ethology,1995
4. Canary 1.2 User's Manual;Charif,1995
5. How Monkeys See the World;Cheney,1990