Lahmar, A., S. Ganschow, J. Doerschel, K. Tsuzuku, M. Couzi, and B. Elouadi. “Crystal Growth and Dielectric Study of the Niobate Series K3Sr2RNb10O30 (R = Lanthanide) of Tungsten Bronze Structure”. Eurasian Chemico-Technological Journal 11, no. 1 (January 20, 2009): 1–6. Accessed May 4, 2024. https://ect-journal.kz/index.php/ectj/article/view/625.