MathSciNet bibliographic data MR549159 (81i:03078) 03E35 (04A15 28A05 54H05) Louveau, Alain $\sigma$$\sigma$-idéaux engendrés par des ensembles fermés et théorèmes d'approximation. (French) Trans. Amer. Math. Soc. 257 (1980), no. 1, 143–169. Article

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