@article{DAN_1979_249_3_a5,
     author = {A. V. Kuznetsov and M. F. Ra\c{t}\u{a}},
     title = {A criterion for functional completeness in classical first-order predicate logic},
     journal = {Doklady Akademii Nauk},
     pages = {540--544},
     publisher = {mathdoc},
     volume = {249},
     number = {3},
     year = {1979},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1979_249_3_a5/}
}