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In this work a system of non-linear elliptic equations is considered, wherethe non-linear term is the sum of a quadratic form and a Sobolev sub-criticalterm. An extra assumption is introduced on the sub-critical term, which isminimal among the ones which guarantee the existence of standing-waves obtainedby estimating frequencies of minimizing sequences with the energy functional.

Energy estimated frequencies of standing-wave solutions to non-linear Klein-Gordon systems in higher dimension