@article{10_4171_ifb_159,
     author = {Eduardo V. Teixeira},
     title = {Uniqueness, symmetry and full regularity of free boundary in optimization problems with volume constraint},
     journal = {Interfaces and free boundaries},
     pages = {133--148},
     year = {2007},
     volume = {9},
     number = {1},
     doi = {10.4171/ifb/159},
     url = {http://geodesic.mathdoc.fr/articles/10.4171/ifb/159/}
}