@article{10_4171_ifb_220,
     author = {Antonio Greco and Bernd Kawohl},
     title = {On the convexity of some free boundaries},
     journal = {Interfaces and free boundaries},
     pages = {503--514},
     year = {2009},
     volume = {11},
     number = {4},
     doi = {10.4171/ifb/220},
     url = {http://geodesic.mathdoc.fr/articles/10.4171/ifb/220/}
}