1. Proceedings Int. Conf. on Inner-Shell Ionization Phenomena and Future Applications, Atlanta, Georgia, April 1972, edited by R. W. Fink, S. T. Manson, J. M. Palms, and P. V. Rao (U.S. Atomic Energy Commission, Oak Ridge, Tenn., 1973).
2. J. Chadwick, Phil. Mag. 24, 594 (1912).
3. W. Brandt, K-Shell Ionization in Ion-Atom Collisions, ref. 1, p. 948.
4. Cf. E. Merzbacher and Ho W. Lewis, Handbuch der Physik, edited by S. Flügge (Springer Verlag 1958) Vol. 34, p„ 166 ff. and references cited therein.
5. Jo Bang and J, M. Hansteen, Kglo Danske Videnskab. Selskab, Mat.-Fys. Medd, 31, No. 13 (1959).