K. Kolentsov, L. Yorukova, A. Zheliaskova, A. Rachkova, Some properties of doped SnO2 thin films used in EL and LC display structures, Bulgarian Journal of Physics (31) 126 (2004)

L. Yorukova, K. Kolentsov, A. Zheliaskova, Colour characteristics of AC HEL structures with various protective layer, Bulgarian Journal of Physics (31) 139 (2004)