MathSciNet bibliographic data MR1369172 (96m:03035) 03F15 Rathjen, Michael Recent advances in ordinal analysis: $\Pi\sp 1\sb 2$$\Pi\sp 1\sb 2$-${\rm CA}$${\rm CA}$ and related systems. Bull. Symbolic Logic 1 (1995), no. 4, 468–485. Article

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