1. Babich, V. M. (1965): On short-wave asymptotics of a solution of the point source problem in an inhomogeneous medium. Zh. Vychisl. Mat. Mat. Fiz. 5, No. 5, 949951 [English translation: USSR COmput. Math. Math. Phys. 5, No. 5, 247–251] Zbl. 167,243
2. Babich, V. M. (1979): A point source of vibrations close to a concave mirror. Zap. Nauchn. Semin. Leningrad. Otd. Mat. Inst. Steklova 89, 3–13 [English translation: J. Sov. Math. 19 (1982), 1279–1287] Zbl. 427.35006
3. Babich, V. M., and Buldyrev, V. S. (1972): Asymptotic Methods in Short-Wave Diffraction Problems. Nauka, Moscow [English translation: Springer Series on Wave Phenomena 4. Springer, Berlin Heidelberg New York 1991] Zbl. 255.35002
4. Babich, V. M., Buldyrev, V. S., and Molotkov, I. A. (1985): The Space-Time Ray Method. Izdat. Leningrad. Gos. Univ. (Leningrad State University Press), Leningrad (in Russian)
5. Babich, V.M., and Kirpichnikova, N.Ya. (1974): The Boundary Layer Method in Diffraction Problems. Izdat. Leningrad. Gos. Univ. (Leningrad State University Press), Leningrad, Zbl 317.35001 (in Russian)