Achim Jung, Umberto Rivieccio. Four-valued modal logic: Kripke semantics and duality. In Nikolaos Galatos, Alexander Kurz, Constantine Tsinakis, editors, TACL 2013. Sixth International Conference on Topology, Algebra and Categories in Logic, Vanderbilt University, Nashville, Tennessee, USA, July 28 - August 1, 2013. Volume 25 of EPiC Series, pages 120-124, EasyChair, 2013. [doi]
Abstract is missing.