1. A. Yu. Loskutov and A. S. Mikhailov,Introduction to Synergetics [in Russian], Nauka, Moscow (1990).
2. V. A. Vasil'ev, Yu. M. Romanovskii, and V. G. Yakhno,Auto-Wave Processes [in Russian], Nauka, Moscow (1987).
3. V. P. Maslov, V. G. Danilov, and K. A. Voloskov,Mathematical Modeling of Heat and Mass Transfer Processes [in Russian], Nauka, Moscow (1987).
4. V. G. Danilov and P. Yu. Subochev,Teor. Mat. Fiz.,89, 25 (1991).
5. S. Choudhary,Phys. Lett. A,159, 331 (1991).