@article{IM_1983__73_143034,
     author = {C.C. Conley and E. Zehnder},
     title = {The {Birkhoff-Lewis} {Fixed} {Point} {Theorem} and a {Conjecture} of {V.I.} {Arnold.}},
     journal = {Inventiones mathematicae},
     pages = {33--50},
     publisher = {mathdoc},
     volume = {73},
     year = {1983},
     zbl = {0516.58017},
     url = {http://geodesic.mathdoc.fr/item/IM_1983__73_143034/}
}