@article{VMUMM_1991_4_a15,
     author = {A. I. Shtern},
     title = {On operators in {Fr{\cyrishrt}chet} spaces that are similar to isometries},
     journal = {Vestnik Moskovskogo universiteta. Matematika, mehanika},
     pages = {67--70},
     publisher = {mathdoc},
     number = {4},
     year = {1991},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/VMUMM_1991_4_a15/}
}