Tim Fischbach, Benjamin Seyfferth. On λ-Definable Functions on Ordinals. In Paola Bonizzoni, Vasco Brattka, Benedikt Löwe, editors, The Nature of Computation. Logic, Algorithms, Applications - 9th Conference on Computability in Europe, CiE 2013, Milan, Italy, July 1-5, 2013. Proceedings. Volume 7921 of Lecture Notes in Computer Science, pages 135-146, Springer, 2013. [doi]
Abstract is missing.