MathSciNet bibliographic data MR277382 (43 #3115) 02.68 Solovay, Robert M. On the cardinality of $\sum \sb{2}\sp{1}$$\sum \sb{2}\sp{1}$ sets of reals. 1969 Foundations of Mathematics (Symposium Commemorating Kurt Gödel, Columbus, Ohio, 1966) pp. 58–73 Springer, New York Links to the journal or article are not yet available

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