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@article{MAN_1980__251_163426, author = {Victor Bangert}, title = {Closed {Geodesics} on {Complete} {Surfaces.}}, journal = {Mathematische Annalen}, pages = {83--96}, publisher = {mathdoc}, volume = {251}, year = {1980}, zbl = {0422.53024}, url = {http://geodesic.mathdoc.fr/item/MAN_1980__251_163426/} }
Victor Bangert. Closed Geodesics on Complete Surfaces.. Mathematische Annalen, Tome 251 (1980), pp. 83-96. http://geodesic.mathdoc.fr/item/MAN_1980__251_163426/