@incollection{AST_1994__222__37_0,
     author = {Brunella, Marco},
     title = {Vanishing holonomy and monodromy of certain centres and foci},
     booktitle = {Complex analytic methods in dynamical systems - IMPA, January 1992},
     editor = {Camacho C. and Lins Neto A. and Moussu R. and Sad P.},
     series = {Ast\'erisque},
     pages = {37--48},
     publisher = {Soci\'et\'e math\'ematique de France},
     number = {222},
     year = {1994},
     language = {en},
     url = {http://archive.numdam.org/item/AST_1994__222__37_0/}
}