MathSciNet bibliographic data MR1372034 (97g:03052) 03E15 (28A05 54H05) Kechris, Alexander S. On the concept of \$\bfPi\sp 1\sb 1\$$\bfPi\sp 1\sb 1$-completeness. Proc. Amer. Math. Soc. 125 (1997), no. 6, 1811–1814. Article

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