Report - Bogdan Sawicki, M. Piz, E. Filipek, Tadeusz Gronń, Henryk ... · diodes,orfluorescencelamps[1–5]. Preliminary studies of the ternary oxides V 2O 5– Yb 2O 3–Y 2O 3 systemhaveshownthat,inoneofitssecti-ons,i.e.

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