1. V. S. Letokhov, Phys. Lett. A 51, 231 (1975).
2. V. S. Letokhov, Laser Photoionization Spectroscopy (Academic, New York, 1987; Nauka, Moscow, 1987).
3. S. A. Aseev, B. N. Mironov, S. V. Chekalin, and V. S. Letokhov, Pis’ma Zh. Eksp. Teor. Fiz. 80, 645 (2004) [JETP Lett. 80, 568 (2004)].
4. T. A. Skotheim, R. L. Elsenbaumer, and J. R. Reynolds, Handbook of Conducting Polymers, 2nd ed. (Marcell Dekker, New York, 1998).
5. Handbook of Conducting Polymers. Conjugated Polymers, 3rd ed., Proc. and Applications, Ed. by T. A. Skotheim, J. R. Reynolds, and A. J. MacDiarmid (CRS Press, 2007).