1. G. L. Jackson, J. Winter, T. S. Tayloret al. (1991).Phys. Rev. Lett. 67:3098.
2. E. A. Lazarus, M. S. Chu, J. R. Ferronet al. (1991).Phys. Fluids B 3:2220.
3. W. W. Heidbrink, E. J. Strait, E. Doyleet al. (1991).Nucl. Fusion 31:1635.
4. M. A. Mahdavi, M. Schaffer, P. Andersonet al. in Proceedings of 13th International Conference on Plasma Physics and Controlled Nuclear Fusion Research, Vol. I, Washington, D.C., 1990, p. 335.
5. T. W. Petrie, D. Buchenauer, R. Campbellet al. in Proceedings of 10th International Conference on Plasma Surface Interactions, Monterey, California, 1992, to be published.