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@article{MAN_1981__258_163592, author = {Frank Hansen and Gerd Kjaergard Pedersen}, title = {Jensen's {Inequality} for {Operators} and {L\"owner} 's {Theorem.}}, journal = {Mathematische Annalen}, pages = {229--242}, publisher = {mathdoc}, volume = {258}, year = {1981}, zbl = {0473.47011}, url = {http://geodesic.mathdoc.fr/item/MAN_1981__258_163592/} }
Frank Hansen; Gerd Kjaergard Pedersen. Jensen's Inequality for Operators and Löwner 's Theorem.. Mathematische Annalen, Tome 258 (1981), pp. 229-242. http://geodesic.mathdoc.fr/item/MAN_1981__258_163592/