@article{ZNSL_1979_90_a12,
     author = {T. A. Shubochkina},
     title = {Averaging kernels with small norms},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {265--267},
     publisher = {mathdoc},
     volume = {90},
     year = {1979},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_1979_90_a12/}
}