Huili Xing, Zhaohui Zhu, Jinjin Zhang. Covariant-Contravariant Refinement Modal Logic. FLAP, 6(1):1-30, 2019. [doi]
@article{XingZZ19, title = {Covariant-Contravariant Refinement Modal Logic}, author = {Huili Xing and Zhaohui Zhu and Jinjin Zhang}, year = {2019}, url = {https://collegepublications.co.uk/ifcolog/?00030}, researchr = {https://researchr.org/publication/XingZZ19}, cites = {0}, citedby = {0}, journal = {FLAP}, volume = {6}, number = {1}, pages = {1-30}, }