@article{10_4171_ifb_213,
     author = {J. Haslinger and K. Ito and T. Kozubek and Karl Kunisch and G. Peichl},
     title = {On the shape derivative for problems of {Bernoulli} type},
     journal = {Interfaces and free boundaries},
     pages = {317--330},
     year = {2009},
     volume = {11},
     number = {2},
     doi = {10.4171/ifb/213},
     url = {http://geodesic.mathdoc.fr/articles/10.4171/ifb/213/}
}