@article{1183739272, author = {Urquhart, Alasdair}, title = {Implicational Formulas in Intuitionistic Logic}, journal = {J. Symbolic Logic}, volume = {39}, number = {1}, year = {1974}, pages = { 661-664}, language = {en}, url = {http://dml.mathdoc.fr/item/1183739272} }
Urquhart, Alasdair. Implicational Formulas in Intuitionistic Logic. J. Symbolic Logic, Tome 39 (1974) no. 1, pp. 661-664. http://gdmltest.u-ga.fr/item/1183739272/