@article{ZNSL_1976_60_a14,
     author = {P. Yu. Suvorov},
     title = {On the recognition of the tautological nature of propositional formulas},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {197--206},
     publisher = {mathdoc},
     volume = {60},
     year = {1976},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_1976_60_a14/}
}