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DOI: https://doi.org/10.1007/s40879-015-0052-6

Funding agency	Grant number
Russian Foundation for Basic Research	14-01-00160 15-01-02158
Ministry of Education and Science of the Russian Federation	5-100
German–Israeli Foundation Grant	1174-197.6/2011
The first author has been supported by Grants of RFBR 14-01-00160 and 15-01-02158, and by the Government of the Russian Federation within the framework of the implementation of the 5-100 Programme Roadmap of the National Research University Higher School of Economics, AG Laboratory. The second author has been supported by the Hermann–Minkowski–Minerva Center for Geometry at the Tel Aviv University and by the German–Israeli Foundation Grant No. 1174-197.6/2011.

Received: 23.12.2014
Accepted: 12.05.2015

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