References
- Zel'dovich , B.Ya. , Pilipetsky , N.F. and Shkunov , V.V. 1986 . Optical Phase Conjugation , Springer Series on Optical Sciences Vol. 42 , Berlin : Springer-Verlag .
- Basov , N.G. , Efimkov , V.F. , Zubarev , I.G. , Kotov , A.V. and Mikhailov , S.I. 1982 . Soviet Jl quant. Electron. , 11 : 1335 – 1335 .