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Solar energy materials & solar cells, 77 (2003) S. 125 - 143
...Beyer, W....
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Applied physics letters, 81 (2002) S. 3347 - 3349
...Beyer, W....
OpenAccess 
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Journal of non-crystalline solids, 299-302 (2002) S. 736 - 740
...Beyer, W....
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Journal of non-crystalline solids, 299-302 (2002) S. 1167 - 1172
...Beyer, W....
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