@article{DAN_1979_247_5_a5,
     author = {A. Pietsch},
     title = {$s${-Numbers} and eigenvalues of operators in {Banach} spaces},
     journal = {Doklady Akademii Nauk},
     pages = {1053--1056},
     publisher = {mathdoc},
     volume = {247},
     number = {5},
     year = {1979},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1979_247_5_a5/}
}