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              Essays on Self-Reference. New York: Columbia UP. (1991). Paradigm lost: On the Ethical Reflection of Morality. Thesis Eleven, 29, 82-94 [(1990). Paradigm lost: Über die ethische Reflexion der Moral. Frank- furt: Suhrkamp].
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              Luhman N. ESSAYS ON SELF-REFERENCE, Columbia University Press, New York 1990
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              Luhmann, N. (1990) Essays on Self-reference. New York: Columbia University Press.
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              Luhmann, N. (1990), Essays on Self-Reference. New York: Columbia University Press.
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              Luhmann, N. (1990). Essays on Self-Reference. New York: Columbia University Press.
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