Convex Matrix Functions.
@article{1789,
title = {Convex Matrix Functions},
journal = {CUBO, A Mathematical Journal},
volume = {4},
year = {2002},
language = {en},
url = {http://dml.mathdoc.fr/item/1789}
}
Hansen, Frank. Convex Matrix Functions. CUBO, A Mathematical Journal, Tome 4 (2002) . http://gdmltest.u-ga.fr/item/1789/