Ghezzi, R.; Remizov, A. O. On a class of vector fields with discontinuities of divide-by-zero type and its applications to geodesics in singular metrics. (English) Zbl 1284.37016 J. Dyn. Control Syst. 18, No. 1, 135-158 (2012). MSC: 37C15 34C05 34C20 PDF BibTeX XML Cite \textit{R. Ghezzi} and \textit{A. O. Remizov}, J. Dyn. Control Syst. 18, No. 1, 135--158 (2012; Zbl 1284.37016) Full Text: DOI
Bonnard, B.; Charlot, G.; Ghezzi, R.; Janin, G. The sphere and the cut locus at a tangency point in two-dimensional almost-Riemannian geometry. (English) Zbl 1209.53014 J. Dyn. Control Syst. 17, No. 1, 141-161 (2011). MSC: 53B20 49K15 53C17 PDF BibTeX XML Cite \textit{B. Bonnard} et al., J. Dyn. Control Syst. 17, No. 1, 141--161 (2011; Zbl 1209.53014) Full Text: DOI