@article{DAN_1962_147_5_a10,
     author = {V. A. Matulis},
     title = {Two variants of the classical predicate calculus without structural inference rules},
     journal = {Doklady Akademii Nauk},
     pages = {1029--1031},
     publisher = {mathdoc},
     volume = {147},
     number = {5},
     year = {1962},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1962_147_5_a10/}
}