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@article{MOMA_1983__95_178122, author = {Werner Ricker}, title = {A {Criterion} for an {Operator} with {Real} {Spectrum} to {Be} of {Scalar-type.}}, journal = {Monatshefte f\"ur Mathematik}, pages = {229--234}, publisher = {mathdoc}, volume = {95}, year = {1983}, zbl = {0507.47020}, url = {http://geodesic.mathdoc.fr/item/MOMA_1983__95_178122/} }
Werner Ricker. A Criterion for an Operator with Real Spectrum to Be of Scalar-type.. Monatshefte für Mathematik, Tome 95 (1983), pp. 229-234. http://geodesic.mathdoc.fr/item/MOMA_1983__95_178122/