MathSciNet bibliographic data MR2113945 (2006b:57040) 57R35 (55N10 55Q05 57R19 57R70) Pintea, Cornel Closed sets which are not $CS\sp \infty$$CS\sp \infty$-critical. Proc. Amer. Math. Soc. 133 (2005), no. 3, 923–930 (electronic). Article

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