Geodesic
Means and convex combinations of unitary operators.
Mathematica Scandinavica, Tome 57 (1985), pp. 249-266.

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Mots-clés : convex combinations, unit ball of a -algebra, group of unitary operators, Murray-von Neumann result, mean of two unitary operators, permutation polytope, convex decomposition, Gelfand-Neumark conjecture, adjoint operation, Russo-Dye theorem, non-commutative topological dimension 
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     author = {Gert K. Pedersen and Richard V. Kadison},
     title = {Means and convex combinations of unitary operators.},
     journal = {Mathematica Scandinavica},
     pages = {249--266},
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     volume = {57},
     year = {1985},
     zbl = {0573.46034},
     url = {http://geodesic.mathdoc.fr/item/MS2_1985__57_166953/}
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Gert K. Pedersen; Richard V. Kadison. Means and convex combinations of unitary operators.. Mathematica Scandinavica, Tome 57 (1985), pp. 249-266. http://geodesic.mathdoc.fr/item/MS2_1985__57_166953/