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@article{MZM_1983_33_6_a12, author = {A. U. Muravitskii}, title = {Extensions of the provability logic}, journal = {Matemati\v{c}eskie zametki}, pages = {915--927}, publisher = {mathdoc}, volume = {33}, number = {6}, year = {1983}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/MZM_1983_33_6_a12/} }
A. U. Muravitskii. Extensions of the provability logic. Matematičeskie zametki, Tome 33 (1983) no. 6, pp. 915-927. http://geodesic.mathdoc.fr/item/MZM_1983_33_6_a12/