@article{AL_1988_27_5_a4,
     author = {L. L. Maksimova},
     title = {Interpolation in infinite-layered extensions of provability},
     journal = {Algebra i logika},
     pages = {581--603},
     year = {1988},
     volume = {27},
     number = {5},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/AL_1988_27_5_a4/}
}