@article{MZ_1975__143_172228,
     author = {Richard Bouldin},
     title = {Approximation the {Shift} with {Toeplitz} {Operators.}},
     journal = {Mathematische Zeitschrift},
     pages = {203--208},
     publisher = {mathdoc},
     volume = {143},
     year = {1975},
     zbl = {0291.47014},
     url = {http://geodesic.mathdoc.fr/item/MZ_1975__143_172228/}
}