@article{1093887827, author = {Orenduff, J. M.}, title = {Are modal contexts referentially opaque?}, journal = {Notre Dame J. Formal Logic}, volume = {18}, number = {1}, year = {1977}, pages = { 128-132}, language = {en}, url = {http://dml.mathdoc.fr/item/1093887827} }
Orenduff, J. M. Are modal contexts referentially opaque?. Notre Dame J. Formal Logic, Tome 18 (1977) no. 1, pp. 128-132. http://gdmltest.u-ga.fr/item/1093887827/