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@article{CMH_1982__57_139912, author = {John N. Mather}, title = {Concavity of the {Lagrangian} for quasi-periodic orbits.}, journal = {Commentarii mathematici Helvetici}, pages = {356--376}, publisher = {mathdoc}, volume = {57}, year = {1982}, zbl = {0508.58037}, url = {http://geodesic.mathdoc.fr/item/CMH_1982__57_139912/} }
John N. Mather. Concavity of the Lagrangian for quasi-periodic orbits.. Commentarii mathematici Helvetici, Tome 57 (1982), pp. 356-376. http://geodesic.mathdoc.fr/item/CMH_1982__57_139912/