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@article{MAN_1969__183_161901, author = {J.G. STAMPFLI}, title = {On {Hyponormal} and {Toeplitz} {Operators.}}, journal = {Mathematische Annalen}, pages = {328--336}, publisher = {mathdoc}, volume = {183}, year = {1969}, zbl = {0175.43104}, url = {http://geodesic.mathdoc.fr/item/MAN_1969__183_161901/} }
J.G. STAMPFLI. On Hyponormal and Toeplitz Operators.. Mathematische Annalen, Tome 183 (1969), pp. 328-336. http://geodesic.mathdoc.fr/item/MAN_1969__183_161901/