@article{MAN_1989__283_1_164506,
     author = {Andrzej Szulkin},
     title = {An {Index} {Theory} and {Existence} of {Multiple} {Brake} {Orbits} for {Star-Shaped} {Hamiltonian} {Systems}},
     journal = {Mathematische Annalen},
     pages = {241--256},
     publisher = {mathdoc},
     volume = {283},
     number = {1},
     year = {1989},
     zbl = {0642.58030},
     url = {http://geodesic.mathdoc.fr/item/MAN_1989__283_1_164506/}
}