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@article{MZ_1968__106_171015, author = {C.R. Putnam}, title = {Hyponormal {Operators} and {Low} {Density} {Spectra.}}, journal = {Mathematische Zeitschrift}, pages = {167--169}, publisher = {mathdoc}, volume = {106}, year = {1968}, zbl = {0157.45503}, url = {http://geodesic.mathdoc.fr/item/MZ_1968__106_171015/} }
C.R. Putnam. Hyponormal Operators and Low Density Spectra.. Mathematische Zeitschrift, Tome 106 (1968), pp. 167-169. http://geodesic.mathdoc.fr/item/MZ_1968__106_171015/