Erich Grädel. Why are Modal Logics so Robustly Decidable?. Bulletin of the EATCS, 68:90-103, 1999.
@article{Gradel99:1, title = {Why are Modal Logics so Robustly Decidable?}, author = {Erich Grädel}, year = {1999}, tags = {modal logic, logic}, researchr = {https://researchr.org/publication/Gradel99%3A1}, cites = {0}, citedby = {0}, journal = {Bulletin of the EATCS}, volume = {68}, pages = {90-103}, }