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@article{MM2_1983__43_154943, author = {L.M. Sibner}, title = {An existence theorem for a non-regular variational problem.}, journal = {Manuscripta mathematica}, pages = {45--72}, publisher = {mathdoc}, volume = {43}, year = {1983}, zbl = {0534.58022}, url = {http://geodesic.mathdoc.fr/item/MM2_1983__43_154943/} }
L.M. Sibner. An existence theorem for a non-regular variational problem.. Manuscripta mathematica, Tome 43 (1983), pp. 45-72. http://geodesic.mathdoc.fr/item/MM2_1983__43_154943/