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3. W. A. Orr and F. P. Califano, 14th IEEE Photovoltaic specialists Conference Record (1980)
4. G. Storti, et al., “Photovoltaic Mechanisms in Polycrystalline Thin Film Solar Cells”, DOE, ET-78-D-01-3413, Report n° 2, pag. 6
5. W. A. Orr, to appear in Il Nuovo Cimento Lettere