@article{IM_1987__90_143499,
     author = {H. Hofer and E. Zehnder},
     title = {Periodic {Solutions} on hypersurfaces and a result by {C.} {Viterbo.}},
     journal = {Inventiones mathematicae},
     pages = {1--10},
     publisher = {mathdoc},
     volume = {90},
     year = {1987},
     zbl = {0631.58022},
     url = {http://geodesic.mathdoc.fr/item/IM_1987__90_143499/}
}