Analysis of semi-relativistic approximations for relativistic (e,2e) experiments L.U. Ancarani, H. Ast, S. Keller, R.M. Dreizler, C.T. Whelan et H.R.J. Walters J. Phys. IV France, 09 PR6 (1999) Pr6-225-Pr6-228 DOI: 10.1051/jp4:1999648