1. W. H. Wells, Bendix Aviation Corporation (private communication, 1954).
2. P. T. Farnsworth, Farnsworth Electronics Company (private communication, 1956).
3. Television by electron image scanning
4. P. T. Farnsworth (private communication).
5. J. L. Tuck, Los Alamos Rept. No. 1190, Los Alamos Manuscript No. 1640.