@article{1093870927, author = {Boolos, George}, title = {$1$-consistency and the diamond.}, journal = {Notre Dame J. Formal Logic}, volume = {26}, number = {1}, year = {1985}, pages = { 341-347}, language = {en}, url = {http://dml.mathdoc.fr/item/1093870927} }
Boolos, George. $1$-consistency and the diamond.. Notre Dame J. Formal Logic, Tome 26 (1985) no. 1, pp. 341-347. http://gdmltest.u-ga.fr/item/1093870927/