References
- Marcuse , D. 1972 . IEEE J. quant. Electron. , : 661 – 669 .
- Miles , R.M. and Grow , R.O. 1978 . IEEE J. quant. Electron. , 14 : 275 – 283 .
- Gorton , P.J. and Jenkins , R.M. 1988 . J. mod. Optics , 35 : 387 – 395 .
- Gorton , P.J. 1989 . PhD Thesis , Birmingham University .