@article{IM_1993__113_2_144135,
     author = {A.M. Bloch and H. Flaschka and T. Ratiu},
     title = {A {Schur-Horn-Kostant} convexity theorem for the diffeomorphism group of the annulus.},
     journal = {Inventiones mathematicae},
     pages = {511--530},
     publisher = {mathdoc},
     volume = {113},
     number = {2},
     year = {1993},
     zbl = {0806.22012},
     url = {http://geodesic.mathdoc.fr/item/IM_1993__113_2_144135/}
}