Berthier, Michel; Loray, Frank Relative cohomology of nondegenerate resonance forms. (Cohomologie relative des formes résonnantes non dégénérées.) (French) Zbl 0896.32017 Asymptotic Anal. 15, No. 1, 41-54 (1997). Reviewer: A.Morimoto (Nagoya) MSC: 32S65 37F99 53C12 PDFBibTeX XMLCite \textit{M. Berthier} and \textit{F. Loray}, Asymptotic Anal. 15, No. 1, 41--54 (1997; Zbl 0896.32017)
Berthier, M.; Cerveau, D.; Lins Neto, A. On real analytic foliations and the center problem. (Sur les feuilletages analytiques réels et le problème du centre.) (French) Zbl 0886.58090 J. Differ. Equations 131, No. 2, 244-266 (1996). Reviewer: G.Swiatek (University Park) MSC: 37C85 PDFBibTeX XMLCite \textit{M. Berthier} et al., J. Differ. Equations 131, No. 2, 244--266 (1996; Zbl 0886.58090) Full Text: DOI
Berthier, Michel A problem of relative cohomology for algebraic forms of \(\mathbb{R}^ 2\). (Un problème de cohomologie relative pour des formes algébriques de \(\mathbb{R}^ 2\).) (French) Zbl 0849.58054 Topology 35, No. 2, 427-437 (1996). Reviewer: Z.Denkowska (Angers) MSC: 37G15 PDFBibTeX XMLCite \textit{M. Berthier}, Topology 35, No. 2, 427--437 (1996; Zbl 0849.58054) Full Text: DOI