MathSciNet bibliographic data MR2187642 (2006i:03013) 03B30 (03C57 03D45 03D80 03F35 06E05) Shore, Richard A. Invariants, Boolean algebras and ${\rm ACA}\sp +\sb 0$${\rm ACA}\sp +\sb 0$. Trans. Amer. Math. Soc. 358 (2006), no. 3, 989–1014 (electronic). Article

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