V. S. Sarkisyan and I. M. Karakhanyan, “ON FACTORIZATION IN THE PROBLEM OF DIFFRACTION OF HARMONIC WAVE ON ELASTIC HALF INFINITE INCLUSION”, Proc. YSU A: Phys. Math. Sci., vol. 35, no. 2 (195), pp. 32–39, Jul. 2001, doi: 10.46991/PYSUA.2001.35.2.032.