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@article{10_4064_cm_22_1_75_84, author = {Humphrey Fong}, title = {On invariant functions for positive operators}, journal = {Colloquium Mathematicum}, pages = {75--84}, publisher = {mathdoc}, volume = {22}, number = {1}, year = {1970}, doi = {10.4064/cm-22-1-75-84}, language = {en}, url = {http://geodesic.mathdoc.fr/articles/10.4064/cm-22-1-75-84/} }
Humphrey Fong. On invariant functions for positive operators. Colloquium Mathematicum, Tome 22 (1970) no. 1, pp. 75-84. doi : 10.4064/cm-22-1-75-84. http://geodesic.mathdoc.fr/articles/10.4064/cm-22-1-75-84/
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