@article{IM_1982__70_142978,
     author = {Takashi Matsuoka},
     title = {The {Number} and {Linking} of {Periodic} {Solutions} of {Periodic} {Systems.}},
     journal = {Inventiones mathematicae},
     pages = {319--340},
     publisher = {mathdoc},
     volume = {70},
     year = {1982},
     zbl = {0538.34025},
     url = {http://geodesic.mathdoc.fr/item/IM_1982__70_142978/}
}