A. Bolsinov and A. Fomenko, Integrable geodesic flows on two-dimensional surfaces, 2000.

B. Bonnard and J. Caillau, A global optimality result with application to orbital transfer, C. R. Acad. Sci. Paris
URL : https://hal.archives-ouvertes.fr/hal-00129535

B. Bonnard, J. Caillau, and R. Dujol, Averaging and optimal control of elliptic Keplerian orbits with low propulsion, Systems & Control Letters, vol.55, issue.9, pp.755-760, 2006.
DOI : 10.1016/j.sysconle.2006.03.004
URL : https://hal.archives-ouvertes.fr/hal-00540280

B. Bonnard, J. Caillau, and E. Trélat, Second order optimality conditions in the smooth case and applications in optimal control, Control, Optimisation and Calculus of Variations

J. Caillau, Sur la géométrie des transferts orbitaux, Habilitation thesis, 2006.

G. Darboux, Leçons sur la théorie générale des surfaces, 1914.

D. Elerath, An improved Toponogov comparison theorem for nonnegatively curved manifolds, Journal of Differential Geometry, vol.15, issue.2, pp.187-216, 1980.
DOI : 10.4310/jdg/1214435490
URL : http://projecteuclid.org/download/pdf_1/euclid.jdg/1214435490

H. Gluck and D. Singer, Scattering of Geodesic Fields, I, The Annals of Mathematics, vol.108, issue.2, pp.347-372, 1978.
DOI : 10.2307/1971170

W. Klingenberg, Riemannian geometry, de Gruyter, 1982.

J. Milnor, On the Geometry of the Kepler Problem, The American Mathematical Monthly, vol.90, issue.6, pp.353-365, 1983.
DOI : 10.2307/2975570

S. B. Myers, Connections between geometry and topology I, Duke Math, J, vol.1, pp.376-391, 1935.
DOI : 10.1073/pnas.21.4.225
URL : http://www.ncbi.nlm.nih.gov/pmc/articles/PMC1076570

S. B. Myers, Connections between geometry and topology II, Duke Math, J, vol.2, pp.95-102, 1936.
DOI : 10.1073/pnas.21.4.225
URL : http://www.ncbi.nlm.nih.gov/pmc/articles/PMC1076570

H. Poincaré, Sur Les Lignes Geodesiques Des Surfaces Convexes, Transactions of the American Mathematical Society, vol.6, issue.3, pp.237-274, 1905.
DOI : 10.2307/1986219

R. Sinclair and M. Tanaka, The cut locus of a two-sphere of revolution and Toponogov's comparison theorem, Tohoku Mathematical Journal, vol.59, issue.3, 2006.
DOI : 10.2748/tmj/1192117984

M. Van-manen, Maxwell sets and caustics, to be published in Proceedings of the Advanced School and workshop on singularity theory, ICTP Trieste, 2005.