@article{DM_1999_11_4_a14,
     author = {L. R. Mutafchiev},
     title = {Letter to the editors},
     journal = {Diskretnaya Matematika},
     pages = {157},
     publisher = {mathdoc},
     volume = {11},
     number = {4},
     year = {1999},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DM_1999_11_4_a14/}
}