We are deeply grateful to Alexei Klimenko for useful discussions and very helpful
comments. The research of A. Bufetov and S. Fan on this project has received funding from the
European Research Council (ERC) under the European Union’s Horizon 2020 research and innovation
programme under Grant agreement No 647133 (ICHAOS). A. Bufetov has also been funded by the Grant
MD 5991.2016.1 of the President of the Russian Federation, by the Russian Academic Excellence Project
‘5-100’ and by the Chaire Gabriel Lamй at the Chebyshev Laboratory of the SPbSU, a joint initiative of the
French Embassy in the Russian Federation and the Saint-Petersburg State University. Y. Qiu is supported by
the Grant IDEX UNITI-ANR-11-IDEX-0002-02, financed by Programme “Investissements d’Avenir” of
theGovernment of the French Republic managed by the French National Research Agency. Part of thiswork
was carried out at the Institut Henri Poincarй and at the Centre international de rencontres mathйmatiques
in the framework of the CIRM “recherche en petits groupes” programme. We are deeply grateful to these
institutions for their warm hospitality.
Received: 27.03.2017
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