@article{FAA_1979_13_3_a12,
     author = {P. P. Zabreiko and S. V. Smitskikh},
     title = {A theorem of {M.} {G.} {Krein} and {M.} {A.} {Rutman}},
     journal = {Funkcionalʹnyj analiz i ego prilo\v{z}eni\^a},
     pages = {81--82},
     publisher = {mathdoc},
     volume = {13},
     number = {3},
     year = {1979},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/FAA_1979_13_3_a12/}
}