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@article{MS2_1995__77_2_167353, author = {Robert Magnus}, title = {On the {Multiplicity} of an {Analytic} {Operator-Valued} {Function.}}, journal = {Mathematica Scandinavica}, pages = {108--118}, publisher = {mathdoc}, volume = {77}, number = {2}, year = {1995}, zbl = {0851.30029}, url = {http://geodesic.mathdoc.fr/item/MS2_1995__77_2_167353/} }
Robert Magnus. On the Multiplicity of an Analytic Operator-Valued Function.. Mathematica Scandinavica, Tome 77 (1995) no. 2, pp. 108-118. http://geodesic.mathdoc.fr/item/MS2_1995__77_2_167353/