1. V. A. Ditkin and A. P. Prudnikov, Handbook of Operational Calculus [in Russian], Moscow (1965).
2. A. A. Kharkevich, Nonsteady Wave Effects [in Russian], Moscow-Leningrad (1950).
3. D. R. Bland, Theory of Linear Viscoelasticity, Pergamon (1960).
4. Kh. A. Rakhmatulin, Ya. U. Saatov, P. F. Sabodash, and I. G. Filippov, Two-Dimensional Problems in the Nonsteady Motion of Compressible Media [in Russian], Tashkent (1969).