MathSciNet bibliographic data MR1311821 03D25 Harrington, Leo; Soare, Robert I. The \$\Delta\sp 0\sb 3\$$\Delta\sp 0\sb 3$-automorphism method and noninvariant classes of degrees. J. Amer. Math. Soc. 9 (1996), no. 3, 617–666. Article

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