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Sato, Kentaro; Zumbrunnen, Rico (2015). A new model construction by making a detour via intuitionistic theories I: Operational set theory without choice is Π1-equivalent to KP. Annals of pure and applied logic, 166(2), pp. 121-186. Elsevier 10.1016/j.apal.2014.10.001
Jäger, Gerhard; Zumbrunnen, Rico (2014). Explicit mathematics and operational set theory: some ontological comparisons. The Bulletin of Symbolic Logic, 20(03), pp. 275-292. Cambridge University Press 10.1017/bsl.2014.21
Jäger, Gerhard; Zumbrunnen, Rico (2012). About the Strength of Operational Regularity. In: Berger, Ulrich; Diener, Hannes; Schuster, Peter (eds.) Logic, Construction, Computation (pp. 305-324). Heusenstamm bei Frankfurt: Ontos
