@article{GDZPPN002413639,
title = {Variational Problems with Obstacles and a Volume Constraint.},
journal = {Mathematische Zeitschrift},
volume = {135},
year = {1973},
pages = {55-68},
zbl = {0284.49017},
url = {http://dml.mathdoc.fr/item/GDZPPN002413639}
}
Hildebrandt, S.; Wente, H.C. Variational Problems with Obstacles and a Volume Constraint.. Mathematische Zeitschrift, Tome 135 (1973) pp. 55-68. http://gdmltest.u-ga.fr/item/GDZPPN002413639/