MathSciNet bibliographic data MR255391 (41 #53) 02.68 (04.00) Martin, D. A.; Solovay, R. M. A basis theorem for $\sum \sb{3}{}\sp{1}$$\sum \sb{3}{}\sp{1}$ sets of reals. Ann. of Math. (2) 89 1969 138–159. Article

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