@article{GDZPPN002320487, title = {Selfadjoint Means and Operator Monotone Functions.}, journal = {Mathematische Annalen}, volume = {255}, year = {1981}, pages = {29-36}, zbl = {0461.47009}, url = {http://dml.mathdoc.fr/item/GDZPPN002320487} }
Hansen, Frank. Selfadjoint Means and Operator Monotone Functions.. Mathematische Annalen, Tome 255 (1981) pp. 29-36. http://gdmltest.u-ga.fr/item/GDZPPN002320487/