@article{JCA_2008_15_4_JCA_2008_15_4_a3,
     author = {Y. Chu and X. Zhang and G. Wang},
     title = {The {Schur} {Geometrical} {Convexity} of the {Extended} {Mean} {Values}},
     journal = {Journal of convex analysis},
     pages = {707--718},
     publisher = {mathdoc},
     volume = {15},
     number = {4},
     year = {2008},
     url = {http://geodesic.mathdoc.fr/item/JCA_2008_15_4_JCA_2008_15_4_a3/}
}