Voir la notice de l'article provenant de la source Math-Net.Ru
@article{DAN_1978_240_3_a12, author = {V. B. Shehtman}, title = {An undecidable superintuitionistic propositional calculus}, journal = {Doklady Akademii Nauk}, pages = {549--552}, publisher = {mathdoc}, volume = {240}, number = {3}, year = {1978}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DAN_1978_240_3_a12/} }
V. B. Shehtman. An undecidable superintuitionistic propositional calculus. Doklady Akademii Nauk, Tome 240 (1978) no. 3, pp. 549-552. http://geodesic.mathdoc.fr/item/DAN_1978_240_3_a12/