@article{JRAM_1961__208_150499,
     author = {Paul R. Halmos},
     title = {Shifts on {Hilbert} spaces.},
     journal = {Journal f\"ur die reine und angewandte Mathematik},
     pages = {102--112},
     publisher = {mathdoc},
     volume = {208},
     year = {1961},
     zbl = {0107.09802},
     url = {http://geodesic.mathdoc.fr/item/JRAM_1961__208_150499/}
}