@article{ZNSL_2013_416_a10,
     author = {N. A. Shirokov},
     title = {A series of operators in $L^2(\mathbb C)$ proportional to unitary ones},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {188--201},
     publisher = {mathdoc},
     volume = {416},
     year = {2013},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_2013_416_a10/}
}