@article{CRMECA_2004__332_8_673_0,
     author = {Youri V. Egorov},
     title = {On the optimization of higher eigenvalues},
     journal = {Comptes Rendus. M\'ecanique},
     pages = {673--678},
     publisher = {Elsevier},
     volume = {332},
     number = {8},
     year = {2004},
     doi = {10.1016/j.crme.2004.03.008},
     language = {en},
}