@article{DM_2019_31_2_a12,
     author = {V. V. Mazalov and L. I. Trukhina},
     title = {Letter to the editors},
     journal = {Diskretnaya Matematika},
     pages = {159},
     publisher = {mathdoc},
     volume = {31},
     number = {2},
     year = {2019},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DM_2019_31_2_a12/}
}