@article{PDM_2019_4_a9,
     author = {A. Yu. Zubov},
     title = {Letter to the editors},
     journal = {Prikladna\^a diskretna\^a matematika},
     pages = {122},
     publisher = {mathdoc},
     number = {4},
     year = {2019},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/PDM_2019_4_a9/}
}