1. J. D. Garcia, R. J. Fortner, T. M. Kavanagh, Rev. Mod. Phys. 45, 111 (1973).
2. R. W. Fink, S. T. Manson, J. M. Palms and P. V. Rao, eds., Proc. of Int. Conf. on Inner Shell Ionization Phenomena and Future Applications (Atlanta, 1972), AEC CONF 720404, V. 2 and 3.
3. R. C. Jopson, H. Mark and C. D. Swift, Phys. Rev. 127, 1612 (1962).
4. P. Richard, I. L. Morgan, T. Furuta and D. Burch, Phys. Rev. Ltrs. 23, 1009 (1969).
5. A. R. Knudson, P. G. Burkhalter and D. J. Nagel in Reference 2, p. 1675.