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@article{CMH_1987__62_140095, author = {V. Bangert}, title = {A uniqueness theorem for {Zn-periodic} variational problems.}, journal = {Commentarii mathematici Helvetici}, pages = {511--531}, publisher = {mathdoc}, volume = {62}, year = {1987}, zbl = {0634.49018}, url = {http://geodesic.mathdoc.fr/item/CMH_1987__62_140095/} }
V. Bangert. A uniqueness theorem for Zn-periodic variational problems.. Commentarii mathematici Helvetici, Tome 62 (1987), pp. 511-531. http://geodesic.mathdoc.fr/item/CMH_1987__62_140095/