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2. Hutter, R.G.E.: Beam and Wave Electronics in Microwave Tubes, (Van Nostrand, New York 1960), p. 332
3. Cohn, G.I.: Theoretical Study and Investigation of Techniques for an Electronic Rapid-Scan Antenna, (Illinois Institute of Technology, Electronics Research Laboratory 1959 April, 1),Phase I, Ia, II, Contract No. DA-36-039 SC-70114