@article{ZNSL_1967_4_a1,
     author = {G. V. Davydov},
     title = {A~proof method for the classical predicate calculus},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {8--17},
     year = {1967},
     volume = {4},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_1967_4_a1/}
}