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2. Royce, J., in Extra terrestrial intelligence: the first encounter, ed. J. Christian. Buffalo: Prometheus Books, 1976, pp. 177–95
3. The Magical World View
4. Rescher, N., in Extraterrestrials: science and alien intelligence, ed. E. Regis. Cambridge: Cambridge University Press, 1985, pp. 83–116
5. Not the sons of Adam