@article{JLT_1993_3_2_a0,
     author = { J. Hilgert and K.-H. Neeb and W. Plank},
     title = {Symplectic {Convexity} {Theorems}},
     journal = {Journal of Lie theory},
     pages = {123--136},
     publisher = {mathdoc},
     volume = {3},
     number = {2},
     year = {1993},
     url = {http://geodesic.mathdoc.fr/item/JLT_1993_3_2_a0/}
}