1. Montgomery, C.G., Dicke, R.H., and Purcell, E.M.: Principles of microwave circuits, (McGraw-Hill 1948)
2. Montgomery, C.G.: Technique of microwave measurements, (McGraw-Hill 1947)
3. Ginzton, E.L.: Microwave measurements, (McGraw-Hill 1957)
4. Sucher, M., and Fox, J.: Handbook of microwave measurements, 3rd edn(Wiley 1963),2, chap. 8,