Mark Ryan, Pierre Yves Schobbens. Counterfactuals and Updates as Inverse Modalities. Journal of Logic, Language and Information, 6(2):123-146, 1997.
@article{RyanS97, title = {Counterfactuals and Updates as Inverse Modalities}, author = {Mark Ryan and Pierre Yves Schobbens}, year = {1997}, researchr = {https://researchr.org/publication/RyanS97}, cites = {0}, citedby = {0}, journal = {Journal of Logic, Language and Information}, volume = {6}, number = {2}, pages = {123-146}, }