1. Andrews, J. 1970 Ph.D. Thesis, University of Kansas, Lawrence.
2. Barkow, W. H., and Gross, J. 1974 Report ST-5015. RCA Entertainment Tube Division, Lancaster, Pennsylvania. (Read at 2nd Annual Convention, Fernseh und Kinotechnische Gesellschaft, Munich, October 15, 1974.
3. Blazo, S., Perkins, P., and Hawken, K. 1977 Tech. Dig.—Int. Electron Devices Meet., 1977 P.81