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2. G. A. Norton and P. P. Leahy,Mineral Commodity Summaries 2006, U.S. Government Printing Office (2006).
3. Japan Environmental Management Association for Industry, “Pioneering investigation of global models for resource recycling and integration” (2006) (in Japanese). http://www.nedo.go.jp/bioiryo/kagaku/event/seminar180426/shiyou1. pdf.
4. Secondary Electron Emission Characteristics of MgO Thin Films Prepared by an Advanced Ion-Plating Method
5. Properties of tin oxide films prepared by reactive electron beam evaporation