Lloyd Humberstone. BCSK Fragment of S5. J. Philosophical Logic, 35(5):435-487, 2006. [doi]
@article{Humberstone06-1, title = {BCSK Fragment of S5}, author = {Lloyd Humberstone}, year = {2006}, doi = {10.1007/s10992-005-9023-6}, url = {http://dx.doi.org/10.1007/s10992-005-9023-6}, researchr = {https://researchr.org/publication/Humberstone06-1}, cites = {0}, citedby = {0}, journal = {J. Philosophical Logic}, volume = {35}, number = {5}, pages = {435-487}, }