@Inproceedings{EPTCS226.18, author = {Libal, Tomer and Volpe, Marco}, year = {2016}, title = {Certification of Prefixed Tableau Proofs for Modal Logic}, editor = {Cantone, Domenico and Delzanno, Giorgio}, booktitle = {{\rm Proceedings of the Seventh International Symposium on} Games, Automata, Logics and Formal Verification, {\rm Catania, Italy, 14-16 September 2016}}, series = {Electronic Proceedings in Theoretical Computer Science}, volume = {226}, publisher = {Open Publishing Association}, pages = {257-271}, doi = {10.4204/EPTCS.226.18}, }