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  1. Introduction to Model Theory and the Metamathematics of Algebra.Abraham Robinson - 1963 - Journal of Symbolic Logic 29 (1):56-56.
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  • Positive definite functions over regular f-rings and representations as sums of squares.W. A. MacCaull - 1989 - Annals of Pure and Applied Logic 44 (3):243-257.
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  • Artin-Schreier theory for commutative regular rings.L. van den Dries - 1977 - Annals of Mathematical Logic 12 (2):113.
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