@article{10_4171_ifb_290,
     author = {Dorin Bucur and Giuseppe Buttazzo and Ulisse Stefanelli},
     title = {Shape flows for spectral optimization problems},
     journal = {Interfaces and free boundaries},
     pages = {521--544},
     year = {2012},
     volume = {14},
     number = {4},
     doi = {10.4171/ifb/290},
     url = {http://geodesic.mathdoc.fr/articles/10.4171/ifb/290/}
}