1. Alt H.W., Caffarelli L.A.: Existence and regularity for a minimum problem with free boundary. J. Reine Angew. Math. 325, 105–144 (1981)
2. Briançon T., Hayouni M., Pierre M.: Lipschitz continuity of state functions in some optimal shaping. Calc. Var. Partial Differ. Equ. 23, 13–32 (2005)
3. Bucur D.: Uniform concentration-compactness for Sobolev spaces on variable domains. J. Differ. Equ. 162, 427–450 (2000)
4. Bucur D.: Regularity of optimal convex shapes. J. Convex Anal. 10, 501–516 (2003)
5. Bucur, D., Buttazzo, G.: Variational methods in shape optimization problems. In: Progress in Nonlinear Differential Equations and their Applications, vol. 65, Birkhäuser, Boston, 2005