1. A.E. Siegmann, P.A. Belanger, A. Hardy: In Optical Phase Conjugation, ed. by R.A. Fisher (Academic, New York 1983) pp.466?532
2. B.H. Soffer, G.S. Dunning, Y. Owechko, E. Marom: Opt. Lett. 11, 118?120 (1986)
3. D.Z. Anderson: Opt. Lett. 11, 56?58 (1986)
4. Y. Fainman, S.H. Lee: In Optical and Hybrid Computing, ed. by H.H. Szu, Proceedings SPIE 634, 380?392 (1987)
5. K.P. Lo, G. Indebetouw: Appl. Opt. (in press)