@article{AMI_2005_32_a8,
     author = {D\'enes Petz},
     title = {Means of positive matrices: {Geometry} and a conjecture},
     journal = {Annales mathematicae et informaticae},
     pages = {129--139},
     publisher = {mathdoc},
     volume = {32},
     year = {2005},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/AMI_2005_32_a8/}
}