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Authors
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Funding
Funding for this research was provided by:
Polish National Science Center (2012/05/D/ST1/01063)
Deutsche Forschungsgemeinschaft (BR 688/22-1)
National Science Foundation (DMS-1301487)
Georgian National Science Foundation (DI/16/5-103/12)
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Article History
Received: 8 June 2015
Revised: 10 February 2016
Accepted: 25 February 2016
First Online: 14 March 2016
