@article{GDZPPN002198525,
title = {Existence and regularity for a minimum problem with free boundary.},
journal = {Journal f\"ur die reine und angewandte Mathematik},
volume = {329},
year = {1981},
pages = {105-144},
zbl = {0449.35105},
url = {http://dml.mathdoc.fr/item/GDZPPN002198525}
}
Alt, H.W.; Caffarelli, L.A. Existence and regularity for a minimum problem with free boundary.. Journal für die reine und angewandte Mathematik, Tome 329 (1981) pp. 105-144. http://gdmltest.u-ga.fr/item/GDZPPN002198525/