1. V. M. Babich and V. S. Buldyrev, Asymptotic Methods in Problems of Diffraction of Short Waves [in Russian], Nauka, Moscow (1972).
2. M. I. Belishev, “On a unitary transformation in the space L 2(Ω;ℝ3) associated with the Weyl decomposition”, Zap. Nauchn. Semin. POMI, 275, 25–40 (2001).
3. M. I. Belishev, “Dynamical inverse problem for a Lame type system,” J. Inv. Ill-Posed Problems, 14, No. 8, 751–766 (2006).
4. M. I. Belishev, “Boundary control in reconstruction of manifolds and metrics (the BC method),” Inv. Problems, 13, No. 5, R1–R45 (1997).
5. M. I. Belishev and A. S. Blagoveshchenskii, Dynamical Inverse Problems in Wave Theory [in Russian], S. Peterb. Univ., St.Petersburg (1999).