Contributions to encyclopedias etc.
Stanford Encyclopedia of Philosophy
Connexive Logic, The Stanford Encyclopedia of Philosophy (Summer 2023 Edition), Edward N. Zalta & Uri Nodelman (eds.), first published on January 6, 2006.
Truth Values, The Stanford Encyclopedia of Philosophy (Spring 2025 Edition), Edward N. Zalta & Uri Nodelman (eds.), with Y. Shramko, first published on March 30, 2010.
Negation, in: The Stanford Encyclopedia of Philosophy (Spring 2020Edition), The Stanford Encyclopedia of Philosophy (Spring 2025 Edition), Edward N. Zalta & Uri Nodelman (eds.), with L. Horn, first published on January 7, 2015.
Other contributions
Formale Erkenntnistheorie. Erkenntnistheorie und epistemische Logik, in: T. Bonk (ed.), Lexikon der Erkenntnistheorie, Wissenschaftliche Buchgesellschaft, Darmstadt, 2013, 76-84, with C. Willkommen.
Logik, in: J. Rohbeck und P. H. Breitenstein (eds.), Philosophie, Metzler, Stuttgart, 2011, 213-231, with C. Semmling.
Definition, in: S. Jordan and C. Nimtz (eds.), Lexikon Philosophie. Hundert Grundbegriffe, Reclam Verlag, Stuttgart, 2009, 61-63.
Logic, in: Giandomenico Sica (ed.), The Language of Science, Polimetrica, Monza, 2007, (5pp).
Ex formulis cognitio, in: V. Hendricks and J. Symons (eds.), Masses of Formal Philosophy, Automatic Press, New York, 2006, 119-227.
Nicht jede zutreffende Information wird gegeben, in: T. Spitzley and R. Stöcker (eds.), Philosophie à la carte, Mentis Verlag, Paderborn, 2002, 51-52.
Proofs and Expressiveness in Alethic Modal Logic, in D. Jacquette (ed.), A Companion to Philosophical Logic, Basil Blackwell Publishers, Cambridge/MA., 2002, 422-441, with M. de Rijke.
Negation, in: H.J. Sandkühler (ed.), Enzyklopädie der Philosophie, Felix Meiner Verlag, Hamburg, 1999.
Modallogik, in: H.J. Sandkühler (ed.), Enzyklopädie der Philosophie, Felix Meiner Verlag, Hamburg, 1999.