Linear instability of relative equilibria for n-body problems in the plane

@article{Barutello2013LinearIO,
  title={Linear instability of relative equilibria for n-body problems in the plane},
  author={Vivina L. Barutello and Riccardo D. Jadanza and Alessandro Portaluri},
  journal={Journal of Differential Equations},
  year={2013},
  volume={257},
  pages={1773-1813}
}

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