@article{1918,
  abstract     = {As the nuclear charge Z is continuously decreased an N-electron atom undergoes a binding-unbinding transition. We investigate whether the electrons remain bound and whether the radius of the system stays finite as the critical value Zc is approached. Existence of a ground state at Zc is shown under the condition Zc < N-K, where K is the maximal number of electrons that can be removed at Zc without changing the energy.},
  author       = {Bellazzini, Jacopo and Frank, Rupert and Lieb, Élliott and Seiringer, Robert},
  journal      = {Reviews in Mathematical Physics},
  number       = {1},
  publisher    = {World Scientific Publishing},
  title        = {{Existence of ground states for negative ions at the binding threshold}},
  doi          = {10.1142/S0129055X13500219},
  volume       = {26},
  year         = {2014},
}