Voir la notice de l'article provenant de la source Math-Net.Ru
@article{DAN_1961_139_2_a12, author = {Ya. S. Smetanich}, title = {On statement calculi with an additional operation}, journal = {Doklady Akademii Nauk}, pages = {309--312}, publisher = {mathdoc}, volume = {139}, number = {2}, year = {1961}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DAN_1961_139_2_a12/} }
Ya. S. Smetanich. On statement calculi with an additional operation. Doklady Akademii Nauk, Tome 139 (1961) no. 2, pp. 309-312. http://geodesic.mathdoc.fr/item/DAN_1961_139_2_a12/