@article{MAT_1971_15_5_a8,
     author = {P. R. Halmos},
     title = {Algebraic and quasialgebraic operators},
     journal = {Matematika},
     pages = {74--83},
     publisher = {mathdoc},
     volume = {15},
     number = {5},
     year = {1971},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MAT_1971_15_5_a8/}
}