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Buchholtz, Ulrik Torben; Jäger, Gerhard; Strahm, Thomas Adrian (2016). Theories of proof-theoretic strength ψ(ΓΩ+1). In: Probst, Dieter; Schuster, Peter (eds.) Concepts of Proof in Mathematics, Philosophy, and ComputerScience. Ontos Mathematical Logic: Vol. 6 (pp. 115-140). De Gruyter 10.1515/9781501502620-007