@article{CC_2008_37_4_a6,
     author = {Cannarsa, Piermarco and Rocchetti, Dario and Vancostenoble, Judith},
     title = {Generation of analytic semi-groups in {L2} for a class of second order degenerate elliptic operators},
     journal = {Control and Cybernetics},
     pages = {831--878},
     year = {2008},
     volume = {37},
     number = {4},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/CC_2008_37_4_a6/}
}