@article{AA_2021_33_2_a0,
     author = {A. P. Kiselev and T. A. Suslina},
     title = {Preface},
     journal = {Algebra i analiz},
     pages = {3--4},
     publisher = {mathdoc},
     volume = {33},
     number = {2},
     year = {2021},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/AA_2021_33_2_a0/}
}