1. Appleton, B. R. L, Feldman, C. and Brown, W. L. Proc. of Int. Conf. on Solid State Phys. Res. with Accelerators. Brookhaven Natl. Lab. Report, BNL # 50083
2. Deamaley, G., Farmery, B. W., Mitchell, I. V., Nelson, R. S. and Thompson, M. W. Proc. of Int. Conf. on Solid State Phys. Res. with Accelerators. Brookhaven Natl. Lab. Internal Report BNL # 50083
3. The penetration of energetic ions through the open channels in a crystal lattice