George Boolos. A curious inference. J. Philosophical Logic, 16(1):1-12, 1987. [doi]
@article{Boolos87,
title = {A curious inference},
author = {George Boolos},
year = {1987},
doi = {10.1007/BF00250612},
url = {http://dx.doi.org/10.1007/BF00250612},
researchr = {https://researchr.org/publication/Boolos87},
cites = {0},
citedby = {0},
journal = {J. Philosophical Logic},
volume = {16},
number = {1},
pages = {1-12},
}