@article{COCV_2005__11_3_310_0,
     author = {Lorent, Andrew},
     title = {A two well {Liouville} theorem},
     journal = {ESAIM: Control, Optimisation and Calculus of Variations},
     pages = {310--356},
     publisher = {EDP-Sciences},
     volume = {11},
     number = {3},
     year = {2005},
     doi = {10.1051/cocv:2005009},
     mrnumber = {2148848},
     zbl = {1082.74039},
     language = {en},
     url = {http://www.numdam.org/articles/10.1051/cocv:2005009/}
}