@article{DAN_1963_151_4_a14,
     author = {V. A. Yankov},
     title = {On certain superconstructive propositional calculi},
     journal = {Doklady Akademii Nauk},
     pages = {796--798},
     publisher = {mathdoc},
     volume = {151},
     number = {4},
     year = {1963},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1963_151_4_a14/}
}