@article{JSFU_2020_13_5_a4,
     author = {Nurlan S. Imanbaev},
     title = {On a problem that does not have basis property of root vectors, associated with a perturbed regular operator of multiple differentiation},
     journal = {\v{Z}urnal Sibirskogo federalʹnogo universiteta. Matematika i fizika},
     pages = {568--573},
     publisher = {mathdoc},
     volume = {13},
     number = {5},
     year = {2020},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/JSFU_2020_13_5_a4/}
}