Spurious states in the Faddeev formalism for few-body systems
  We discuss the appearance of spurious solutions of few-body equations for Faddeev amplitudes. The identification of spurious states, i.e., states that lack the symmetry required for solutions of the Schroedinger equation, as well as the symmetrization of the Faddeev equations is investigated. As an example, systems of three and four electrons, bound in a harmonic-oscillator potential and interacting by the Coulomb potential, are presented. 
P. Navratil, B. R. Barrett (University of Arizona), W. Gloeckle (Ruhr   University Bochum)