The Effective Non-Relativistic Hamiltonian for Electron-Nucleus   Interaction
  We present the effective Hamiltonian for an electron-nucleus interaction in non-relativistic limit up to the second order in the inverse nucleon mass. This Hamiltonian takes into account the distortion of electron waves and allows to calculate its effect as well as matrix elements for off-shell transitions in $(e,e'p)$ reactions. 
R.Ya.Kezerashvili (Dipartimento di Fisica, Universita'di Pisa and   INFN, Sezione di Pisa)