David Kaplan. On the logic of demonstratives. J. Philosophical Logic, 8(1):81-98, 1979. [doi]
@article{Kaplan79-0, title = {On the logic of demonstratives}, author = {David Kaplan}, year = {1979}, doi = {10.1007/BF00258420}, url = {http://dx.doi.org/10.1007/BF00258420}, researchr = {https://researchr.org/publication/Kaplan79-0}, cites = {0}, citedby = {0}, journal = {J. Philosophical Logic}, volume = {8}, number = {1}, pages = {81-98}, }