Geodesic
Means and Concave Products of Positive Semi-Definite Matrices.
Mathematische Annalen, Tome 264 (1983), pp. 119-128.

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Mots-clés : binary operation for positive semi-definite matrices, harmonic mean, super additive, connection in the sense of Kubo and Ando, concavity, concave products of positive semi-definite matrices 
@article{MAN_1983__264_163774,
     author = {Frank Hansen},
     title = {Means and {Concave} {Products} of {Positive} {Semi-Definite} {Matrices.}},
     journal = {Mathematische Annalen},
     pages = {119--128},
     publisher = {mathdoc},
     volume = {264},
     year = {1983},
     zbl = {0495.47021},
     url = {http://geodesic.mathdoc.fr/item/MAN_1983__264_163774/}
}
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Frank Hansen. Means and Concave Products of Positive Semi-Definite Matrices.. Mathematische Annalen, Tome 264 (1983), pp. 119-128. http://geodesic.mathdoc.fr/item/MAN_1983__264_163774/