@article{DAN_1969_185_5_a6,
     author = {A. I. Plotkin},
     title = {Isometric operators in spaces of summable analytic and harmonic functions},
     journal = {Doklady Akademii Nauk},
     pages = {995--997},
     publisher = {mathdoc},
     volume = {185},
     number = {5},
     year = {1969},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1969_185_5_a6/}
}