@article{AIF_1994__44_1_129_0,
     author = {Garofalo, Nicola and Shen, Zhongwei},
     title = {Carleman estimates for a subelliptic operator and unique continuation},
     journal = {Annales de l'Institut Fourier},
     pages = {129--166},
     publisher = {Institut Fourier},
     address = {Grenoble},
     volume = {44},
     number = {1},
     year = {1994},
     doi = {10.5802/aif.1392},
     mrnumber = {94m:35037},
     zbl = {0791.35017},
     language = {en},
     url = {http://archive.numdam.org/articles/10.5802/aif.1392/}
}