@article{AL_1997_36_5_a0,
     author = {P. A. Alekseev and M. I. Golovanov},
     title = {On admissible rules for the polymodal logic ${\rm S}5_n{\rm},
     journal = {Algebra i logika},
     pages = {483--493},
     publisher = {mathdoc},
     volume = {36},
     number = {5},
     year = {1997},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/AL_1997_36_5_a0/}
}