Lahmar, A., S. Ganschow, J. Doerschel, K. Tsuzuku, M. Couzi, and B. Elouadi. 2009. “Crystal Growth and Dielectric Study of the Niobate Series K3Sr2RNb10O30 (R = Lanthanide) of Tungsten Bronze Structure”. Eurasian Chemico-Technological Journal 11 (1):1-6. https://doi.org/10.18321/ectj407.