@article{VTPMK_2017_1_a7,
     author = {I. A. Gorbunov},
     title = {An effective criterion of deductivity of a sets of logical formulas},
     journal = {Vestnik Tverskogo gosudarstvennogo universiteta. Seri\^a Prikladna\^a matematika},
     pages = {95--103},
     publisher = {mathdoc},
     number = {1},
     year = {2017},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/VTPMK_2017_1_a7/}
}