Geodesic
On the unitary spectrum of contraction operators in the Banach space
Zapiski Nauchnykh Seminarov POMI, Investigations on linear operators and function theory. Part II, Tome 22 (1971), pp. 65-74 
A. S. Markus; L. N. Nikol'skaya; N. K. Nikol'skii. On the unitary spectrum of contraction operators in the Banach space. Zapiski Nauchnykh Seminarov POMI, Investigations on linear operators and function theory. Part II, Tome 22 (1971), pp. 65-74. http://geodesic.mathdoc.fr/item/ZNSL_1971_22_a5/
@article{ZNSL_1971_22_a5,
     author = {A. S. Markus and L. N. Nikol'skaya and N. K. Nikol'skii},
     title = {On the unitary spectrum of contraction operators in the {Banach} space},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {65--74},
     year = {1971},
     volume = {22},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_1971_22_a5/}
}
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