B. Bogosel, B. Velichkov: A multiphase shape optimization problem for eigenvalues: qualitative study and numerical results SIAM Numer. Anal. 2013 B. Bogosel, D. Bucur, A. Giacomini: Optimal shapes maximizing the Steklov eigenvalues (SIAM J. Math. Analysis (to appear)) 2016 B. Bogosel, D. Bucur, I. Fragalà: Phase field approach to optimal packing problems and related Cheeger clusters (Submitted Paper) 2017 B. Bogosel, A. Henrot, I. Lucardesi: Minimization of the eigenvalues of the Dirichlet-Laplacian with a diameter constraint (Submitted Paper) 2018