Gerhard Jäger Fixed Points in Peano Arithmetic with Ordinals. [Citation Graph (0, 0)][DBLP] Ann. Pure Appl. Logic, 1993, v:60, n:2, pp:119-132 [Journal]
Siu-Ah Ng Loeb Extensions and Ultrapowers of Measures on Fragments. [Citation Graph (0, 0)][DBLP] Ann. Pure Appl. Logic, 1993, v:60, n:2, pp:179-189 [Journal]
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