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Gutiérrez, Carlos; Sotomayor, Jorge; Garcia, Ronaldo Bifurcations of umbilic points and related principal cycles. (English) Zbl 1075.53004 J. Dyn. Differ. Equations 16, No. 2, 321-346 (2004). Reviewer: Marcela Popescu (Craiova) MSC: 53A05 37G10 37K45 PDF BibTeX XML Cite \textit{C. Gutiérrez} et al., J. Dyn. Differ. Equations 16, No. 2, 321--346 (2004; Zbl 1075.53004) Full Text: DOI arXiv OpenURL
Garcia, Ronaldo; Gutierrez, Carlos; Sotomayor, Jorge Lines of principal curvature around umbilics and Whitney umbrellas. (English) Zbl 0973.37012 Tohoku Math. J., II. Ser. 52, No. 2, 163-172 (2000). MSC: 37C20 58K40 53A05 PDF BibTeX XML Cite \textit{R. Garcia} et al., Tôhoku Math. J. (2) 52, No. 2, 163--172 (2000; Zbl 0973.37012) Full Text: DOI OpenURL