MathSciNet bibliographic data MR2022382 03D28 Shore, Richard A. Minimal degrees which are \$\Sigma\sp 0\sb 2\$$\Sigma\sp 0\sb 2$ but not \$\Delta\sp 0\sb 2\$$\Delta\sp 0\sb 2$. Proc. Amer. Math. Soc. 132 (2004), no. 2, 563–565 (electronic). Article

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