@article{COCV_2014__20_2_442_0,
     author = {Iversen, Mette and Mazzoleni, Dario},
     title = {Minimising convex combinations of low eigenvalues},
     journal = {ESAIM: Control, Optimisation and Calculus of Variations},
     pages = {442--459},
     publisher = {EDP-Sciences},
     volume = {20},
     number = {2},
     year = {2014},
     doi = {10.1051/cocv/2013070},
     mrnumber = {3264211},
     zbl = {1290.49096},
     language = {en},
     url = {http://www.numdam.org/articles/10.1051/cocv/2013070/}
}