@article{MZM_2001_69_3_a9,
     author = {M. K. Potapov},
     title = {Properties of a {Family} of {Operators}},
     journal = {Matemati\v{c}eskie zametki},
     pages = {412--426},
     publisher = {mathdoc},
     volume = {69},
     number = {3},
     year = {2001},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_2001_69_3_a9/}
}