@article{GDZPPN002225182, title = {On the obstacle problem with a volume constraint.}, journal = {Manuscripta mathematica}, volume = {43}, year = {1983}, pages = {73-84}, zbl = {0524.49005}, url = {http://dml.mathdoc.fr/item/GDZPPN002225182} }
Eisen, Goswin. On the obstacle problem with a volume constraint.. Manuscripta mathematica, Tome 43 (1983) pp. 73-84. http://gdmltest.u-ga.fr/item/GDZPPN002225182/