Binding of charmonium with two- and three-body nuclei
  The energies of the (eta_c d) and (eta_c 3He) bound states are calculated on the basis of exact three- and four-body AGS equations. For the eta_c N interaction a Yukawa-type potential has been adopted. The calculations are done for a certain range of its strength parameter. The results obtained are quite different from calculations based on the folding model. 
V.B. Belyaev, N.V. Shevchenko, A.I. Fix and W. Sandhas