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Siegel, H. S. (1987). Effects of behavioural and physical stressors on immune responses. London: Martinus Nijhoff.
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Tizard I. (1987). An introduction to veterinary immunology. Philadelphia: WB Saunders Co.
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Harrington, F. H. (1987). Aggressive howling in wolves. Anim Behav, 35.
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