1. V. Vazov, Asymptotic Expansions of Solutions of Ordinary Differential Equations [in Russian], Mir, Moscow (1968).
2. S. A. Lomov, Introduction into the General Theory of Singular Disturbances [in Russian], Nauka, Moscow (1981).
3. A. H. Nyfe, Introduction to Perturbation Techniques, John Wiley & Sons, New York–Chichester–Brisbane–Toronto (1981).
4. A. L. Gol’denveizer, Theory of Elastic Thin Shells [in Russian], Nauka, Moscow (1976).
5. L. A. Aghalovyan, Asymptotic Theory of Anisotropic Plates and Shells [in Russian], Nauka, Moscow (1997).