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Jäger, Gerhard (2023). Identity, Equality, and Extensionality in Explicit Mathematics. In: Bridges, Douglas; Ishihara, Hajime; Rathjen, Michael; Schwichtenberg, Helmut (eds.) Handbook of Constructive Mathematics. Encyclopedia of Mathematics and its Applications (pp. 564-583). Cambridge University Press 10.1017/9781009039888.022
Bärtschi, Michael; Jäger, Gerhard Max (2020). Having a look again at some theories of proof-theoretic strengths around Γ₀. In: Kahle, Reinhard; Rathjen, Michael (eds.) The Legacy of Kurt Schütte (pp. 103-128). Cham: Springer 10.1007/978-3-030-49424-7_9
Jäger, Gerhard; Probst, Dieter (2015). A Proof-Theoretic Analysis of Theories for Stratified Inductive Definitions. In: Kahle, Reinhard; Rathjen, Michael (eds.) Gentzen's Centenary - The Quest for Consistency (pp. 425-454). Springer 10.1007/978-3-319-10103-3_15