A Characterization of the Veblen-Schütte Functions by Means of Functionals
On the Finsler and Doner-Tarski Arithmetical Hierarchies.
Über die FINSLERschen höheren arithmetischen Operationen.
Ordinal Bounds for Well Ordered Extensions of the Coordinatewise Partial Ordering
The Cartesian product of sets and the Hessenberg natural product of ordinals
A characterization of Takeuti's ordinal diagrams of finite order.
On extending endomorphisms to automorphisms.
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