@article{DAN_1987_297_3_a0,
     author = {S. N. Artemov and G. K. Japaridze},
     title = {Effective predicate logics of provability},
     journal = {Doklady Akademii Nauk},
     pages = {521--523},
     publisher = {mathdoc},
     volume = {297},
     number = {3},
     year = {1987},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1987_297_3_a0/}
}