@article{AL_1966_5_2_a1,
     author = {Yu. Sh. Gurevich},
     title = {Effective recognition of realizability of formulae of the},
     journal = {Algebra i logika},
     pages = {25--55},
     publisher = {mathdoc},
     volume = {5},
     number = {2},
     year = {1966},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/AL_1966_5_2_a1/}
}