1. Electron emission in intense electric fields
2. Refining The application of Fowler–Nordheim Theory;Forbes;Ultramicroscopy,1999
3. Vacuum electronics for the 21st century;Abrams;IEEE Microwave Mag.,2001
4. Microwave Tubes;Gilmour,1986
5. W.M. Middleton (Ed.), Electron tubes, Reference Data for Engineers: Radio, Electronics, Computer and Communications, 9th Edition, Butterworth-Heinemann, Boston, MA, 2002, Chapter 16.