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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
Strahm, Thomas (2010). Weak theories of operations and types. In: Schindler, Ralf (ed.) Ways of Proof Theory. Ontos mathematical logic: Vol. 2 (pp. 441-468). Heusenstamm bei Frankfurt: Ontos
