@article{COCV_2014__20_2_315_0,
     author = {Brasco, Lorenzo},
     title = {On torsional rigidity and principal frequencies: an invitation to the {Kohler-Jobin} rearrangement technique},
     journal = {ESAIM: Control, Optimisation and Calculus of Variations},
     pages = {315--338},
     publisher = {EDP-Sciences},
     volume = {20},
     number = {2},
     year = {2014},
     doi = {10.1051/cocv/2013065},
     mrnumber = {3264206},
     zbl = {1290.35160},
     language = {en},
     url = {http://www.numdam.org/articles/10.1051/cocv/2013065/}
}