1. S. A. Akhmanov and M. A. Vorontsov, in: Nonlinear Waves: Dynamics and Evolution [in Russian], Nauka, Moscow (1989), pp. 228–237.
2. S. P. Kuznetsov, Dynamic Chaos: Course of Lectures [in Russian], Fizmatgiz, Moscow (2001).
3. A. A. Balyakin and N. M. Ryskin, Izv. Ross. Akad. Nauk, Ser. Fiz., 65, No.12, 1741–1744 (2001).
4. I. V. Izmailov, V. T. Kalaida, A. L. Magazinnikov, and B. N. Poizner, Izv. Vyssh. Uchebn. Zaved., Prikl. Nelin. Dinam., 7, No.5, 47–59 (1999).
5. K. Ikeda, Opt. Commun., 30, No.2, 257–260 (1979).