@incollection{AST_2009__323__33_0,
     author = {Brochero Mart{\'\i}nez, Fabio Enrique and L\'opez-Hernanz, Lorena},
     title = {Gevrey class of the infinitesimal generator of a diffeomorphism},
     booktitle = {\'Equations diff\'erentielles et singularit\'es. En l'honneur de J. M. Aroca},
     editor = {Cano F. and Loray F. and Moralez-Ruiz J. J. and Sad P. and Spivakovsky M.},
     series = {Ast\'erisque},
     pages = {33--40},
     publisher = {Soci\'et\'e math\'ematique de France},
     number = {323},
     year = {2009},
     zbl = {1195.32008},
     language = {en},
     url = {http://archive.numdam.org/item/AST_2009__323__33_0/}
}