1. Géodésiques des surfaces de révolution;Besson;Semin. Théor. Spectr. Geom.,1991
2. Optimality results in orbit transfer;Bonnard;C. R. Acad. Sci. Paris, Ser. I,2007
3. B. Bonnard, J.-B. Caillau, Singular metrics on the two-sphere in space mechanics, HAL preprint, 2008, no. 00319299, 1–25.
4. Conjugate and cut loci of a two-sphere of revolution with application to optimal control;Bonnard;Ann. Inst. H. Poincare Anal. Non Lineaire,2009
5. Geodesics and deformed spheres;Faridi;Proc. Amer. Math. Soc.,1987