%0 Journal Article %A J. Haslinger %A K. Ito %A T. Kozubek %A Karl Kunisch %A G. Peichl %T On the shape derivative for problems of Bernoulli type %J Interfaces and free boundaries %D 2009 %P 317-330 %V 11 %N 2 %U http://geodesic.mathdoc.fr/articles/10.4171/ifb/213/ %R 10.4171/ifb/213 %F 10_4171_ifb_213