Voir la notice de l'article provenant de la source Math-Net.Ru
@article{DAN_1969_185_1_a6, author = {L. A. Levin}, title = {Some syntactic theorems on {Ju.\,T.~Medvedev's} calculus of finite problems}, journal = {Doklady Akademii Nauk}, pages = {32--33}, publisher = {mathdoc}, volume = {185}, number = {1}, year = {1969}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DAN_1969_185_1_a6/} }
L. A. Levin. Some syntactic theorems on Ju.\,T.~Medvedev's calculus of finite problems. Doklady Akademii Nauk, Tome 185 (1969) no. 1, pp. 32-33. http://geodesic.mathdoc.fr/item/DAN_1969_185_1_a6/