Tore Langholm. H. B. Smith on modality: A logical reconstruction. J. Philosophical Logic, 16(4):337-346, 1987. [doi]
@article{Langholm87, title = {H. B. Smith on modality: A logical reconstruction}, author = {Tore Langholm}, year = {1987}, doi = {10.1007/BF00431182}, url = {http://dx.doi.org/10.1007/BF00431182}, researchr = {https://researchr.org/publication/Langholm87}, cites = {0}, citedby = {0}, journal = {J. Philosophical Logic}, volume = {16}, number = {4}, pages = {337-346}, }