@article{MM2_1983__43_154944,
     author = {Goswin Eisen},
     title = {On the obstacle problem with a volume constraint.},
     journal = {Manuscripta mathematica},
     pages = {73--84},
     publisher = {mathdoc},
     volume = {43},
     year = {1983},
     zbl = {0524.49005},
     url = {http://geodesic.mathdoc.fr/item/MM2_1983__43_154944/}
}