1. Alfvén, H., Lindberg, L., Malmfors, K. G., Wallmark, I. and Astroem, E.: Theory and applications of trochotrons. Transactions of the Royal Institute of Technology (Stockholm) 22 (1948).
2. Alfvén, Hannes and Romell, Dag: A new electron tube: The strophotron. Proc. IRE 42, 1239 (1954).
3. Allis, W. P.: Electronic orbits in the cylindrical magnetron with static fields. Rep. V.G.S.M.I.T. Rad. Lab. (1941).
4. Auner, M.: Beitrag zur Theorie der ebenen Magnetfeld-Röhren. S. B. Akad. Wiss. Wien 152, Abt. IIa, 143 (1943).
5. Azéma, C.: The modes of oscillation of magnetron anodes. Bull. Soc. Franc. Elect. (Sér. 6) 9, 559 (1949).