@article{MAT_1960_4_1_a6,
     author = {C. Foias},
     title = {Sur certains th\'eor\`emes de {J.} von {Neumann} concernant les ensembles spectraux},
     journal = {Matematika},
     pages = {125--130},
     publisher = {mathdoc},
     volume = {4},
     number = {1},
     year = {1960},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MAT_1960_4_1_a6/}
}