@article{MZ_1993__212_4_174470,
     author = {H. Hofer and A. Floer},
     title = {Coherent orientations for periodic orbit problems in symplectic geometry.},
     journal = {Mathematische Zeitschrift},
     pages = {13--38},
     publisher = {mathdoc},
     volume = {212},
     number = {4},
     year = {1993},
     zbl = {0789.58022},
     url = {http://geodesic.mathdoc.fr/item/MZ_1993__212_4_174470/}
}