David M. Pepper

Amplified reflection, phase conjugation, and oscillation in degenerate four-wave mixing.

A Yariv, A. Yariv, D. Pepper, 1977, Optics letters.

A theoretical and experimental investigation of the modes of optical resonators with phase-conjugate mirrors

A. Yariv, J. Auyeung, D. Fekete, 1979, IEEE Journal of Quantum Electronics.