Науменко A., N. Korniyenko, V. Yashchuk, V. Bliznyuk, and S. Singamaneni. “Phonon-Like Light Scattering in Polycrystalline Carbon Structures”. Ukrainian Journal of Physics, vol. 57, no. 2, Feb. 2012, p. 197, doi:10.15407/ujpe57.2.197.