@article{IVM_2020_1_a2,
     author = {I. A. Gorbunov},
     title = {A theories of classical propositional logic and counterimages of substitutions},
     journal = {Izvesti\^a vys\v{s}ih u\v{c}ebnyh zavedenij. Matematika},
     pages = {26--29},
     publisher = {mathdoc},
     number = {1},
     year = {2020},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/IVM_2020_1_a2/}
}