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2. B. M. Barbashov and N. A. Chernikov, “Solution of the two plane wave scattering problem in a nonlinear scalar field theory of the Born-Infeld type,” Sov. Phys. JETP 24 (2), 437–442 (1967) [transl. from Zh. Eksp. Teor. Fiz. 51 (2), 658–668 (1966)].
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