- E. Goris, J. J. Joosten, “Self provers and 1 sentences”, Logic Journal of IGPL, 20, no. 1, 2012, 1

- Albert Visser, “A course on bimodal provability logic”, Annals of Pure and Applied Logic, 73, no. 1, 1995, 109

- Giorgi Japaridze, Dick de Jongh, 137, Handbook of Proof Theory, 1998, 475

- E. Goris, J. J. Joosten, “Modal Matters for Interpretability Logics”, Logic Journal of IGPL, 16, no. 4, 2008, 371

- E. Goris, J. J. Joosten, “A new principle in the interpretability logic of all reasonable arithmetical theories”, Logic Journal of IGPL, 19, no. 1, 2011, 1
