1. J. Cole, Perturbation Methods in Applied Mathematics [Russian translation], Mir, Moscow (1972).
2. G. B. Whitham, Linear and Nonlinear Waves, Wiley Interscience, New York (1974).
3. G. V. Lipman and A. Roshko, Elements of Gas Dynamics [Russian translation], IL, Moscow (1960).
4. F. I. Frankl' and E. A. Karpovich, Gas Dynamics of Thin Bodies [in Russian], Gostekhizdat, Moscow-Leningrad (1948).
5. U. R. Sears (ed.), General Theory of Aerodynamics at High Velocities [Russian translation], Voenizdat, Moscow (1962).