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2. Adams, E. W.: 1965, ?Elements of a Theory of Inexact Measurement?, Philosophy of Science 32, 205?28.
3. Armstrong, David: 1973, Belief, Truth and Knowledge, Cambridge University Press, Cambridge.
4. Armstrong, David: 1978, Universals and Scientific Realism, Vol. II. A Theory of Universals, Cambridge University Press, Cambridge.
5. Bealer, George: 1981, Quality and Concept, Clarendon Press, Oxford.