MathSciNet bibliographic data MR311656 13F20 (13A15) Arnold, J. T.; Brewer, J. W. When \$(D[[X]])\sb{P[[X]]}\$$(D[[X]])\sb{P[[X]]}$ is a valuation ring. Proc. Amer. Math. Soc. 37 (1973), 326–332. Article

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