@article{AL_1990_29_2_a6,
     author = {A. G. Pinus},
     title = {Intervals and chains in epimorphism skeletons of},
     journal = {Algebra i logika},
     pages = {207--219},
     publisher = {mathdoc},
     volume = {29},
     number = {2},
     year = {1990},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/AL_1990_29_2_a6/}
}