@misc{DM_1989_1_4_a13,
     title = {V.~A.~Emilichev, {O.~I.~Mel'nikov,} {V.~I.~Sarvanov,} {R.~I.~Tyshkevich
}},
     journal = {Diskretnaya Matematika},
     pages = {140},
     publisher = {mathdoc},
     volume = {1},
     number = {4},
     year = {1989},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DM_1989_1_4_a13/}
}