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Second nature : economic origins of human evolution
Ofek, Haim, (2001)
Evolutionary models in economics and law : cooperation versus conflict strategies
Hirshleifer, Jack, (1982)
Sociobiology : a new paradigm for the behavioral sciences?
Berghe, Pierre L. van den, (1978)
Marx
Singer, Peter, (1980)
Practical ethics
Singer, Peter, (1979)
Democracy and disobedience
Singer, Peter, (1973)