@article{GDZPPN002412551,
title = {Interior C1 + ...-Regularity of Solutions of Two-Dimesional Variational Problems with Obstacles.},
journal = {Mathematische Zeitschrift},
volume = {135},
year = {1973},
pages = {233-240},
zbl = {0275.49007},
url = {http://dml.mathdoc.fr/item/GDZPPN002412551}
}
Hildebrandt, Stefan. Interior C1 + ...-Regularity of Solutions of Two-Dimesional Variational Problems with Obstacles.. Mathematische Zeitschrift, Tome 135 (1973) pp. 233-240. http://gdmltest.u-ga.fr/item/GDZPPN002412551/