@article{MZM_2007_82_6_a10,
     author = {N. M. Rubtsova},
     title = {Logic of {Proofs} with {Substitution}},
     journal = {Matemati\v{c}eskie zametki},
     pages = {905--915},
     publisher = {mathdoc},
     volume = {82},
     number = {6},
     year = {2007},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_2007_82_6_a10/}
}