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Solar energy materials & solar cells, 119 (2013) S. 134 - 143
...Schropp, R. E. I....
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Journal of non-crystalline solids, 358 (2012) 17, S. 1962 - 1965
...Schropp, R.E.I....
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Solid state phenomena, 80 - 81 (2001) S. 109 - 114
...Schropp, R. E. I....
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Journal of non-crystalline solids, 266-269 (2000) S. 194
...Schropp, R. E. I....