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2. Anderson JR (1990) The adaptive character of thought. Lawrence Erlbaum Associates, Hillsdale
3. Anderson AR, Belnap ND (1975) Entailment: the logic of relevance and necessity, vol 1. Princeton University Press, Princeton
4. Aristotle (1882) The organon, or, logical treatises of Aristotle. George Bell, London. Translated by O. F. Owen
5. Aristotle (1989) Prior analytics. Hackett Publishing Company, Indianapolis. Translated by R. Smith