, Lectures on the free period Lagrangian action functional, J. Fixed Point Theory Appl, vol.13, issue.2, pp.397-430, 2013.
, Infinitely many periodic orbits of exact magnetic flows on surfaces for almost every subcritical energy level, preprint arXiv:1404.7641, to appear in J. Eur, Closed geodesics on complete surfaces, pp.251-83, 1980.
, HOMOLOGY GENERATED BY ITERATED CLOSED GEODESICS, Topology, vol.22, issue.4, pp.379-388, 1983.
DOI : 10.1142/9789812812797_0033
URL : http://doi.org/10.1016/0040-9383(83)90033-2
, Infinite-dimensional Morse theory and multiple solution problems, Progress in Nonlinear Differential Equations and their ApplicationsFra92] J. Franks, Geodesics on S 2 and periodic points of annulus homeomorphisms, pp.403-418, 1992.
, Periodic geodesics on compact riemannian manifolds, Journal of Differential Geometry, vol.3, issue.3-4, pp.493-510, 1969.
DOI : 10.4310/jdg/1214429070
URL : http://projecteuclid.org/download/pdf_1/euclid.jdg/1214429070
, Condition (C) for the energy integral on certain path spaces and applications to the theory of geodesics, J. Differ. Geom, vol.8, pp.207-223, 1973.
, The isometry-invariant geodesics problem: Closed and open, Lecture Notes in Mathematics Bull. Amer. Math. Soc, vol.17, issue.3, pp.125-140, 1976.
DOI : 10.1007/BF02684341
, Transformation groups in differential geometry Reprint of the 1972 edition. [Maz12] M. Mazzucchelli, Critical point theory for Lagrangian systems On the multiplicity of isometry-invariant geodesics on product manifolds, Isometry-invariant geodesics and the fundamental group, Math. Ann, pp.135-156, 1995.
, On the existence of infinitely many isometry-invariant geodesics, Journal of Differential Geometry, vol.17, issue.2, pp.171-184, 1982.
DOI : 10.4310/jdg/1214436918