@article{COCV_2015__21_2_487_0,
     author = {Beauchard, Karine and Helffer, Bernard and Henry, Raphael and Robbiano, Luc},
     title = {Degenerate parabolic operators of {Kolmogorov} type with a geometric control condition},
     journal = {ESAIM: Control, Optimisation and Calculus of Variations},
     pages = {487--512},
     publisher = {EDP-Sciences},
     volume = {21},
     number = {2},
     year = {2015},
     doi = {10.1051/cocv/2014035},
     zbl = {1311.93042},
     mrnumber = {3348409},
     language = {en},
     url = {http://www.numdam.org/articles/10.1051/cocv/2014035/}
}