%0 Journal Article %A L. A. Levin %T Some syntactic theorems on Ju.\,T.~Medvedev's calculus of finite problems %J Doklady Akademii Nauk %D 1969 %P 32-33 %V 185 %N 1 %I mathdoc %U http://geodesic.mathdoc.fr/item/DAN_1969_185_1_a6/ %G ru %F DAN_1969_185_1_a6