@article{MZM_2018_103_2_a3,
     author = {D. B. Didenko},
     title = {Spectral {Properties} of the {Operators~}$AB$ and $BA$},
     journal = {Matemati\v{c}eskie zametki},
     pages = {196--209},
     publisher = {mathdoc},
     volume = {103},
     number = {2},
     year = {2018},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_2018_103_2_a3/}
}