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@article{MAN_1957__133_160545, author = {H. Beckert}, title = {Existenzbeweise mehrdimensionaler regul\"arer {Variationsprobleme.}}, journal = {Mathematische Annalen}, pages = {191--218}, publisher = {mathdoc}, volume = {133}, year = {1957}, zbl = {0084.31702}, url = {http://geodesic.mathdoc.fr/item/MAN_1957__133_160545/} }
H. Beckert. Existenzbeweise mehrdimensionaler regulärer Variationsprobleme.. Mathematische Annalen, Tome 133 (1957), pp. 191-218. http://geodesic.mathdoc.fr/item/MAN_1957__133_160545/