@article{AIHPC_2013__30_3_477_0,
     author = {Bucur, Dorin and Buttazzo, Giuseppe and Velichkov, Bozhidar},
     title = {Spectral optimization problems with internal constraint},
     journal = {Annales de l'I.H.P. Analyse non lin\'eaire},
     pages = {477--495},
     publisher = {Elsevier},
     volume = {30},
     number = {3},
     year = {2013},
     doi = {10.1016/j.anihpc.2012.10.002},
     zbl = {1287.49049},
     language = {en},
     url = {http://archive.numdam.org/articles/10.1016/j.anihpc.2012.10.002/}
}