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3. Topics in Applied Physics;A. Laubereau,1988
4. Springer Series in Optical Sciences;V. G. Dimitriev,1991
5. S. A. AKHMANOV, V. A. VYSLOUKH and A. S. CHIRKIN, Optics of Femtosecond Laser Pulses (American Institute of Physics, New York, 1992), p. 137.