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A simple proof of multiplicity for periodic solutions of Lagrangian difference systems with relativistic operator and periodic potential |
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| Authors: | J Mawhin |
| Institution: | 1. Institut de Recherche en Mathématique et Physique, Université Catholique de Louvain, Louvain-la-Neuve, Belgium.jean.mawhin@uclouvain.be |
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