MathSciNet bibliographic data

MR673794 (84f:03047) 03E55 (03E05 03E35 03E60) Mitchell, William How weak is a closed unbounded ultrafilter? Logic Colloquium '80 (Prague, 1980), pp. 209--230, Stud. Logic Foundations Math., 108, North-Holland, Amsterdam-New York, 1982.

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