1. C. M. Bowden, M. Ciftan andH. Robl (eds), ?Optical Bistability I? (Plenum, New York, 1981).
2. C. M. Bowden, H. M. Gibbs andS. L. McCall (eds), ?Optical Bistability II? (Plenum, New York, 1984).
3. S. P. Tewari andS. S. Hassan,Optica Acta 29 (1982) 1091.
4. S. S. Hassan andS. P. Tewari, in ?Quantum Electronics and Electro-optics?, edited by P. L. Knight (Wiley, London, 1983) pp. 217?20.
5. O. S. Heavens, ?Optical Properties of Thin Solid Films? (Dover, New York, 1965) Ch. 7.