Periodic solutions of quadratic lagrangian systems on -convex sets
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Annamaria Canino (1991)
Annales de la Faculté des sciences de Toulouse : Mathématiques
Christov, Ognyan, Dragnev, Dragomir (1995)
Serdica Mathematical Journal
The present paper deals with the KAM-theory conditions for systems describing the motion of a particle in central field.
Mark J. Gotay, James M. Nester (1980)
Annales de l'I.H.P. Physique théorique
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