Abstract
Source conditions of the type
Funding source: Deutsche Forschungsgemeinschaft
Award Identifier / Grant number: HO 1454/10-1
Funding statement: Research supported by Deutsche Forschungsgemeinschaft (DFG-grant HO 1454/10-1).
Acknowledgements
The author thanks the anonymous referees for their comments that helped to improve this paper. The helpful comments and discussions with Bernd Hofmann (TU Chemnitz) and Oliver Ernst (TU Chemnitz) are gratefully acknowledged.
References
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