@article{CRMATH_2017__355_12_1215_0,
     author = {Koenig, Armand},
     title = {Non-null-controllability of the {Grushin} operator in {2D}},
     journal = {Comptes Rendus. Math\'ematique},
     pages = {1215--1235},
     publisher = {Elsevier},
     volume = {355},
     number = {12},
     year = {2017},
     doi = {10.1016/j.crma.2017.10.021},
     language = {en},
     url = {http://www.numdam.org/articles/10.1016/j.crma.2017.10.021/}
}