@article{ZNSL_1972_32_a19,
     author = {V. P. Chernov},
     title = {On constructive operators of finite types},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {140--147},
     publisher = {mathdoc},
     volume = {32},
     year = {1972},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_1972_32_a19/}
}