@article{AL_1995_34_3_a5,
     author = {E. A. Palyutin},
     title = {On coverings by classes of permutable equivalence relations},
     journal = {Algebra i logika},
     pages = {316--322},
     publisher = {mathdoc},
     volume = {34},
     number = {3},
     year = {1995},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/AL_1995_34_3_a5/}
}