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Alberucci, Luca; Krähenbühl, Jürg; Studer, Thomas (2014). Justifying induction on modal μ-formulae. Logic Journal of IGPL, 22(6), pp. 805-817. Oxford University Press 10.1093/jigpal/jzu001
Jäger, Gerhard; Krähenbühl, Jürg (2010). Choice in a Theory of sets and classes. In: Schindler, Ralf (ed.) Ways of Proof Theory. Ontos mathematical logic: Vol. 2 (pp. 283-314). Heusenstamm bei Frankfurt: Ontos
