Timothy Smiley. Relative Necessity. Journal of Symbolic Logic, 28(2):113-134, 1963.
@article{Smiley63,
title = {Relative Necessity},
author = {Timothy Smiley},
year = {1963},
researchr = {https://researchr.org/publication/Smiley63},
cites = {0},
citedby = {0},
journal = {Journal of Symbolic Logic},
volume = {28},
number = {2},
pages = {113-134},
}