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  van Sark, W.; Korte, L.; Roca, F.: Introduction - Physics and Technology of Amorphous-Crystalline Heterostructure Silicon Solar cells. In: van Sark, W.; Korte, L.; Roca, F. [Eds.] : Physics and Technology of Amorphous-Crystalline Heterostructure Silicon Solar cellsBerlin: Springer, 2012 (Engineering Materials). - ISBN 978-3-642-22274-0, p. 1-12