@article{COCV_2009__15_3_569_0,
     author = {Figalli, Alessio},
     title = {A geometric lower bound on {Grad's} number},
     journal = {ESAIM: Control, Optimisation and Calculus of Variations},
     pages = {569--575},
     publisher = {EDP-Sciences},
     volume = {15},
     number = {3},
     year = {2009},
     doi = {10.1051/cocv:2008032},
     mrnumber = {2542573},
     zbl = {1167.49040},
     language = {en},
     url = {http://www.numdam.org/articles/10.1051/cocv:2008032/}
}