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4. A. G. Litvak, V. A. Mironov, and A. M. Sergeev, Phys. Scr. 30, 57 (1990).
5. V. E. Zhakharov, Zh. Éksp. Teor. Fiz. 62, 1745 (1972) [Sov. Phys. JETP 35, 908 (1972)].