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2. Davis, S. F., Whiteside, D. A., Thomas, R. L., & Heck, D. G. Cooperative defensive burying: Fact or fancy? Unpublished manuscript, 1980.
3. Pinel, J. P. J., Treit, D., & Terlecki, L. J. Selected filmed sequences of conditioned defensive burying in the rat. Paper presented at the annual meeting of the Psychonomic Society. Phoenix, Arizona, November 1979.