On the observation of the fine structure effect in non-relativistic (e, 2e) processesM. Kampp, S. Kawano, P. J.P. Roche, J. Rasch, D. H. Madison, H. R.J. Walters and C. T. WhelanEur. Phys. J. D, 29 1 (2004) 17-19DOI: https://doi.org/10.1140/epjd/e2004-00014-6