@article{GDZPPN002209861,
title = {Regularity of differential forms minimizing degenerate elliptic functionals.},
journal = {Journal f\"ur die reine und angewandte Mathematik},
volume = {426},
year = {1992},
pages = {7-64},
zbl = {0776.35006},
url = {http://dml.mathdoc.fr/item/GDZPPN002209861}
}
Hamburger, C. Regularity of differential forms minimizing degenerate elliptic functionals.. Journal für die reine und angewandte Mathematik, Tome 426 (1992) pp. 7-64. http://gdmltest.u-ga.fr/item/GDZPPN002209861/