@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/}
}