IFor reviews see Rev. Mod. Phys. ~, 129 (1974) and D. V. Morgan, Ed, Channeling ( Lindhard, K. and Sons, N. Y., 1973). 2J Fich, A. J. Golvchenko, K. O. Nielsen, E. Uggerhoj, G Dan. Vidensk. Selsk. Mat.-Fys. Medd. ~, No. 14 (1965). 30
sD S. Nigmanov, et al. Wegner - Preprint 1975. sT A. Carrigan 76/26, March 1976. 7R G. W. Temmer, Jr., Phys. Rev. Let. ~, 206 (75) J. P. Davidson and B. Korn (eds.), Proceedings of the Kentucky Conference on Low-Medium Mass Nuclei 192 (1973)
Collisions in Solids, ( K. Dettman and M. T. Robinson, 1975), and A. Golovchenko and H. Esbensen, Phys. Rev. BIO, 1 (1974). lOJ Rev. A, Univ. of Aarhus Preprint, submitted to Phys 1975