1. P. D. Maycock, The World Photovoltaic Market, June 15, 2002, http: /www. pvenergy. com.
2. S. Nara, Y. Sakaguchi, 12 th Workshop on Crystalline Silicon Solar Cell Materials and Processes, NREL/BK-520-32717, p.28, (2002).
3. Y. Komatsu, Y. Takaba, S. Yasukawa, S. Okamoto, M. Shimizu, 12th Workshop on Crystalline Silicon Solar Cell Materials and Processes, NREL/BK-520-32717, p.87, (2002).
4. SEMI M6-1000, Specification for Silicon Wafers for Use as Photovoltaic Solar Cells, Semiconductor Equipment and Materials International, www. semi. org.
5. L. J. Geerligs, 12th NREL workshop on silicon solar cell materials, NREL/BK-520-32717, p.288, (2002).