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Zahn-Waxler, C. & R. - Y., M. (1982). The development of altruism: Alternative research strategies. In N. Eisenberg (Ed.), The development of prosocial behavior (pp. 109–138). New York: Academic Press.
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Boitani, L. (1982). Patterns of homesites attendance in two Minnesota wolf packs. In F. H. Harrington, & P. C. Paquet (Eds.), Wolves of the World: Perspectives of Behavior, Ecology and Conservation. New York: Noyes, Park Ridge.
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