@article{10_4171_ifb_18,
     author = {Paolo Tilli},
     title = {On a constrained variational problem with an arbitrary number of free boundaries},
     journal = {Interfaces and free boundaries},
     pages = {201--212},
     year = {2000},
     volume = {2},
     number = {2},
     doi = {10.4171/ifb/18},
     url = {http://geodesic.mathdoc.fr/articles/10.4171/ifb/18/}
}