@article{10_4171_ifb_113,
     author = {Arshak Petrosyan and Enrico Valdinoci},
     title = {Geometric properties of {Bernoulli-type} minimizers},
     journal = {Interfaces and free boundaries},
     pages = {55--78},
     year = {2005},
     volume = {7},
     number = {1},
     doi = {10.4171/ifb/113},
     url = {http://geodesic.mathdoc.fr/articles/10.4171/ifb/113/}
}