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DOI: https://doi.org/10.1088/1361-6544/ac0f4e

Funding agency	Grant number
Russian Science Foundation	20-11-20214.
National Natural Science Foundation of China	11871232
China Scholarship Council
We are very grateful to Alexey Bolsinov, Jonathan Eckhardt, Jenya Ferapontov, Boris Khesin and Sergei Tabachnikov for helpful and encouraging discussions and to the referees for the very useful suggestions. LHW is grateful to the Department of Mathematical Sciences, Loughborough University for the hospitality during the academic year 2019-20, when the work had been mostly done. The work of APV was partially supported by the Russian Science Foundation Grant No. 20-11-20214. LW was supported by National Natural Science Foundation of China (Project No. 11871232) and China Scholarship Council.

Received: 03.10.2020
Revised: 29.04.2021
Accepted: 28.06.2021

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