@article{MZM_2021_110_6_a3,
     author = {I. A. Gorbunov},
     title = {Theories of the {Classical} {Propositional} {Logic} and {Substitutions}},
     journal = {Matemati\v{c}eskie zametki},
     pages = {856--864},
     year = {2021},
     volume = {110},
     number = {6},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_2021_110_6_a3/}
}