1. ] J. C. Ashley, R. H. Ritchie, and W. Brandt, Phys. Rev. B5, 2393 (1972).
2. H. H. Andersen, H. Simonsen, and H. Sørensen, Nucl. Phys. A125, 171 (1969).
3. Tables of the function κ(b,x) over a wide range of x for b = 1.8 ± 0.2, as well as an extended discussion of the work described in this paper will soon be available in: J. C. Ashley, R. H. Ritchie, and W. Brandt, Phys. Rev. (to be published).
4. W. H. Barkas, Nuovo Cimento 8, 201 (1958).
5. See, e.g., M. M. Shapiro, “Nuclear Emulsions,” in Handbuch der Physik, edited by S. Flügge (Springer-Verlag, Heidelberg, 1958) Vol. 45, p. 361 ff.