@article{MZM_1984_35_3_a8,
     author = {V. F. Gaposhkin},
     title = {Tauberian ergodic theorem for normal contraction operators},
     journal = {Matemati\v{c}eskie zametki},
     pages = {397--404},
     publisher = {mathdoc},
     volume = {35},
     number = {3},
     year = {1984},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1984_35_3_a8/}
}