@article{AL_2013_52_4_a3,
     author = {L. L. Maksimova},
     title = {Restricted interpolation over modal logic~$\mathrm S4$},
     journal = {Algebra i logika},
     pages = {461--501},
     publisher = {mathdoc},
     volume = {52},
     number = {4},
     year = {2013},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/AL_2013_52_4_a3/}
}