2.
(avec J.M. Lasry) "Sur le nombre de
points critiques de
fonctions invariantes par des groupes", Note CRAS
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3. "Legendre duality in non-convex
optimization and calculus of variations",
SIAM J. Opt. and Control 15 (1977), p.905-934 [pdf]
4.
"Discontinuités de champs
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Publications Mathématiques de l'IHES 47 (1977),
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5. (avec J.P. Aubin) "Second-order equations with convex Hamiltonian", Canadian Math. Bull. 23 (1980), p.81-94 [pdf]
6. (avec F. Clarke) "Solutions périodiques, de période donnée, des équations hamiltoniennes", Note CRAS Paris 287 (1978), p.1013-1015
7.
(avec F. Clarke) "Hamiltonian
trajectories having prescribed
minimal period", Comm. Pure App. Math. 33 (1980),
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8.
"Periodic solutions to Hamiltonian
equations and a theorem of P.
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9. (avec J.M. Lasry) "Nombre de solutions périodiques des équations de Hamilton", Note CRAS Paris 288 (1979), p.209-211
10.
(avec J.M. Lasry) "On the number of
periodic trajectories for a
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11.
"Solutions périodiques des
équations de Hamilton", in
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12. (avec F. Clarke) "Oscillations entretenues de systèmes hamiltoniens non linéaires", Note CRAS Paris 289 (1979), p.393-395
13. (avec F. Clarke) "Nonlinear oscillations and boundary-value problems for Hamiltonian systems", Arch. Rat. Mech. and An. 78 (1982), p.315-333
14.
"Forced oscillations for nonlinear
Hamiltonian systems II",
Advances in Mathematics, volume in honour of L. Schwartz,
Nachbin ed., Academic Press, 1981
15. (avec J.M. Lasry) "Principes variationnels en dualité", Note CRAS Paris 291 (1980), p.493-497
16.
(avec J.M. Lasry) "Duality in
non-convex variational problems",
Advances in Hamiltonian Systems, Aubin, Bensoussan and Ekeland
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17.
"Oscillations de systèmes
hamiltoniens non linéaires III",
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18.
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19. "Dualité et stabilité des systèmes hamiltoniens", CRAS Paris 294 (1982), p.673-6876
20. "Dual variational methods in non-convex optimization and differential equations", Mathematical Theories of Optimization, Cecconi and Zolezzi ed., Springer Lecture Notes in Mathematics 979 (1983) p.108-120
21. "A Morse theory for Hamiltonian systems", Differential Equations, Knowles and Lewis ed., North-Holland (1984), p.165-172
22.
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23. "Hypersurfaces pincées et systèmes hamiltoniens", Note CRAS Paris 299 (1984), p.669-672
24. "An index theory for periodic solutions of convex Hamiltonian systems", Nonlinear Functional Analysis and its Applications, F. Browder editor, Proceedings of Symposia in Pure Mathematics 45 (1986), p. 395-423
25. (with H. Hofer) "Periodic solutions with prescribed period for convex autonomous Hamiltonian systems", Inventiones Math 81 (1985), p. 155-188
26. (with A. Ambrosetti and C. Coti Zelati) "Symmetry breaking in critical point theory and applications" J. Diff. Eq. 67 (1987), p.165-184
27. "Periodic solutions of convex Hamiltonian sysems: the index and its use", Nonlinear oscillations for conservative systems, Ambrosetti ed., Pitagora editrice, 1985
28. (avec L. Lassoued) "Un flot Hamiltonien a au moins deux trajectoires fermées sur toute surface d'énergie convexe et bornée", Note CRAS Paris 301 (1985), p.162-164
29. (avec L. Lassoued) "Multiplicité des trajectoires fermées d'un système Hamiltonien sur une hypersurface d'énergie convexe", Annales IHP "Analyse non linéaire" 4 (1987) p.1-29
30. (avec H. Hofer) "Subharmonics of convex non-autonomous Hamiltonian systems", Comm. Pure and Applied Math 40 (1987), p. 1-37
31. "Some variational problems arising from mathematical economics", Mathematical Economics, CIME Lectures 1986, Ambrosetti, Gori and Luchetti ed., Springer, Lecture Notes in Mathematics n°1330
32. (avec H. Hofer), "Sur les hypersurface convexes et leurs caractéristiques fermées", Note CRAS Paris, 304 (1987), p. 237-240
33. (avec H. Hofer) "Convex Hamiltonian energy surfaces and their closed trajectories", Comm Math. Physics 113 (1987) p.419-467
34. "Variational methods", p. 5041-5047, Systems and Control Encyclopedia, Madan Singh editor , Pergamon Press, 1987
35. "The calculus of variations: from minimization problems to critical point theory", Contributions to modern calculus of variations, Cesari editor, p. 91-101, Pitman Research Notes, Longman, 1987
36. "The mountain-pass theorem and some applications", Minimax results of Liusternik-Schnirelman type and applications, Séminaire de Mathématiques Supérieures, Université de Montréal, 1989
37. (with H. Hofer) "Two symplectic fixed-point theorems with applications to Hamiltonian dynamics", J. Math. Pures et App. 68 (1989), p.467-489
38 (with H. Hofer) "Capacités symplectiques", Note CRAS Paris, 307 (1988), p.37-40
39. (with H. Hofer) "Symplectic topology and Hamiltonian dynamics", Zeitschrift für Mathematik 200 (1989) p.355-378
40. (with B.M. d'Onofrio), "Hamiltonian systems with elliptic periodic orbits", Nonlinear Analysis TMA 14 (1990) p. 11-21
41. (with B.M. D'Onofrio) "Morse theory and the existence of periodic solutions of elliptic type", in Variational methods", Berestycki, Ekeland and Coron ed. , Birkhaüser, Progress in Nonlinear Differential Equations and their Applications, 1990, p. 447-454
42. (with V. Coti Zelati and Eric Séré), "Solutions doublement asymptotiques de systèmes hamiltoniens convexes", Note CRAS Paris 310 (1990) p. 631-633
43. (with V. Coti Zelati and Eric Séré), " A variational approach to homoclinic orbits in Hamiltonian systems", Mathematische Annalen (1990) p. 133-160
44. (with A. Ambrosetti), "Periodic solutions of a class of singular Hamiltonian systems", Proc. Royal Soc. Edinburgh 114 A(1990), p.1-13 (volume in honor of Jack Hale)
45. (with A. Ambrosetti), "Perturbation results for a class of singular Hamiltonian systems", Rendiconti dell'Academia dei Lincei, (8), 83 (1989), pp. 129-132
46. (with H. Hofer) "Symplectic topology and Hamiltonian dynamics II", Mathematische Zeitschrift, 203 (1990) p. 553-567
47. "Les solutions périodiques en mécanique analytique", Actes du Colloque sur la "Mécanique Analytique" de Lagrange et son héritage, Paris, 27-29 Septembre1989, fondation Hugot du Collége de France; Atti della Accademia delle Scienze di Torino 124 (1990) , supplemento, p.159-167
48 (with V. Coti Zelati and P.L. Lions) "Index estimates and critical points of functionals not satisfying Palais-Smale" , Annali della Scuola Normale Superiore di Pisa, Scienze Fisiche e Matematiche, Serie IV Vol XVII Fasc.4 (1990) p. 569-582
49. (with S. Mathlouti) "Calcul numérique de la capacité symplectique", Progress in Variational Methods in Hamiltonian systems and elliptic equations, Wiley, Pitman Research Notes in Math., Ser 243, p. 68-91 (1992)
50. (with G.F. Dell'Antonio and B.M. D'Onofrio) "Stability from index estimates for periodic solutions of Hamiltonian systems", J. Diff. Eq, 108 (1994) p. 170-189
51. (with G.F. Dell'Antonio and B.M. D'Onofrio) "Les systèmes hamiltoniens convexes et pairs ne sont pas ergodiques en général", CRAS Paris, 315 (1992) p. 1413-1415
52. (with G.F. Dell'Antonio and B.M. D'Onofrio) "Nonergodic properties of systems of oscillators coupled through convex even potentials", Variational methods in nonlinear analysis, p. 77-83, A. Ambrosetti and K.C. Chang ed. , Gordon and Breach, 1995
53. (with G.F. Dell'Antonio and B.M. D'Onofrio) "Periodic solutions of elliptic type for strongly nonlinear Hamiltonian systems", Floer memorial volume, Birkhauser, 1995, p. 327-335
54. (with N. Ghoussoub and H. Tehrani) "Multiple solutions for a classical problem in the calculus of variations", J. Diff.Equ. 131 (1996), p. 229-243 [pdf]
55. (with N. Ghoussoub) "Equivariant Liusternik-Schnirelman theory
for non-even functionals", Annales de l'IHP, Analyse non
linéaire 15 (1998) p 341-370 [pdf]
56. (with N. Ghoussoub) "Selected new aspects of the calculus of
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