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@article{MS2_1973__33_166320, author = {Yngve Domar}, title = {A {Theorem} of {Beurling-Helson} {Type.}}, journal = {Mathematica Scandinavica}, pages = {139--144}, publisher = {mathdoc}, volume = {33}, year = {1973}, zbl = {0271.43008}, url = {http://geodesic.mathdoc.fr/item/MS2_1973__33_166320/} }
Yngve Domar. A Theorem of Beurling-Helson Type.. Mathematica Scandinavica, Tome 33 (1973), pp. 139-144. http://geodesic.mathdoc.fr/item/MS2_1973__33_166320/