@article{DAN_1965_161_6_a1,
     author = {F. L. Varpakhovskii},
     title = {The non-realizability of disjunction of non-realizable formulae of the propositional calculus},
     journal = {Doklady Akademii Nauk},
     pages = {1257--1258},
     year = {1965},
     volume = {161},
     number = {6},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1965_161_6_a1/}
}