P. P. Puga, A. I. Gomonai, G. D. Puga, A. N. Gomonai, P. S. Danyliuk, V. M. Rizak, L. Kvetkova, N. N. Birov, “Raman scattering by glassy lithium tetrabotate activated with Tb$_{2}$O$_{3}$”, Optics and Spectroscopy, 128:10 (2020), 1449–1455; Optics and Spectroscopy, 128:10 (2020), 1559–1565
