@article{1183744617, author = {Gordeev, L.}, title = {A Modified Sentence Unprovable in $\mathbf{PA}$}, journal = {J. Symbolic Logic}, volume = {59}, number = {1}, year = {1994}, pages = { 1154-1157}, language = {en}, url = {http://dml.mathdoc.fr/item/1183744617} }
Gordeev, L. A Modified Sentence Unprovable in $\mathbf{PA}$. J. Symbolic Logic, Tome 59 (1994) no. 1, pp. 1154-1157. http://gdmltest.u-ga.fr/item/1183744617/