@article{DAN_1968_181_1_a7,
     author = {V. A. Yankov},
     title = {The construction of a sequence of strongly independent superintuitionistic propositional calculi},
     journal = {Doklady Akademii Nauk},
     pages = {33--34},
     publisher = {mathdoc},
     volume = {181},
     number = {1},
     year = {1968},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1968_181_1_a7/}
}