Stéphane Demri. A Logic with Relative Knowledge Operators. Journal of Logic, Language and Information, 8(2):167-185, 1999.
@article{Demri99, title = {A Logic with Relative Knowledge Operators}, author = {Stéphane Demri}, year = {1999}, tags = {logic}, researchr = {https://researchr.org/publication/Demri99}, cites = {0}, citedby = {0}, journal = {Journal of Logic, Language and Information}, volume = {8}, number = {2}, pages = {167-185}, }