Samuli Heilala, Brigitte Pientka. Bidirectional Decision Procedures for the Intuitionistic Propositional Modal Logic IS4. In Frank Pfenning, editor, Automated Deduction - CADE-21, 21st International Conference on Automated Deduction, Bremen, Germany, July 17-20, 2007, Proceedings. Volume 4603 of Lecture Notes in Computer Science, pages 116-131, Springer, 2007. [doi]
Abstract is missing.