@article{SM_2020_211_9_a4,
     author = {M. E. Shirokov},
     title = {Operator $E$-norms and their use},
     journal = {Sbornik. Mathematics},
     pages = {1323--1353},
     publisher = {mathdoc},
     volume = {211},
     number = {9},
     year = {2020},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SM_2020_211_9_a4/}
}