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3. Kelly, Crhis, A Theory of the Good, Ph.D. Thesis, University of Colorado, Boulder, CO, 2003.
4. Kelly, Chris, “Value Monism, Richness, and Environmental Ethics,” Les ateliers de l’éthique/The Ethics Forum, vol. 9, no. 2, 2014, pp. 100-129.
5. Leibniz, Gottfried Wilhelm, Discourse on Metaphysics, Manchester, Manchester University Press,1953.