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@article{MM2_1986__57_155190, author = {Michael Wiegner}, title = {On minima of variational problems with some nonconvex constraints.}, journal = {Manuscripta mathematica}, pages = {149--168}, publisher = {mathdoc}, volume = {57}, year = {1986}, zbl = {0605.49005}, url = {http://geodesic.mathdoc.fr/item/MM2_1986__57_155190/} }
Michael Wiegner. On minima of variational problems with some nonconvex constraints.. Manuscripta mathematica, Tome 57 (1986), pp. 149-168. http://geodesic.mathdoc.fr/item/MM2_1986__57_155190/