@article{ZNSL_2021_499_a0,
     author = {S. I. Nikolenko and S. I. Repin and M. A. Skopina},
     title = {Preface},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {5--6},
     publisher = {mathdoc},
     volume = {499},
     year = {2021},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_2021_499_a0/}
}