D. V. Isakov, T. R. Volk, L. I. Ivleva, K. Betzler, C. David, A. Tunyagi, M. Wöhlecke, “Study of ferroelectric switching by domain-wall induced light scattering”, Pis'ma v Zh. Èksper. Teoret. Fiz., 80:4 (2004), 289–293; JETP Letters, 80:4 (2004), 258–262
