1. AMBOSS , K. , 1967 , Technical Report ECOM-01463-6, Quarterly Report No. 6 , Hughes Research Laboratories , Malibu , California .
2. Electron Beam Focusing in Three-Anode Guns for Travelling Wave Tubes†
3. Behaviour of Electron Beams in Increasing Magnetic FieldsZα(α><1)†
4. Behavior of electron beams under magnetic compression
5. TALBOT , K. I. , and JOHNSON , C. C. , 1965 ,Proceedings of the Fifth International Congress on Microwave Tubes( Paris Dunod ), p. 352 .