FENG, R. Y. Implications of Reciprocity in the Evolution of Ethnocentrism and Cooperation. McGill Science Undergraduate Research Journal, Montréal, Canada, v. 15, n. 1, p. 24–29, 2020. DOI: 10.26443/msurj.v15i1.6. Disponível em: https://msurjonline.mcgill.ca/article/view/6. Acesso em: 18 may. 2024.