@article{IVM_2021_1_a6,
     author = {Y. A. Rovba and P. G. Patseika},
     title = {Letter to the editors},
     journal = {Izvesti\^a vys\v{s}ih u\v{c}ebnyh zavedenij. Matematika},
     pages = {97--99},
     publisher = {mathdoc},
     number = {1},
     year = {2021},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/IVM_2021_1_a6/}
}