Funding for this research was provided by:
Department of Mathematics, Imperial College London
EPSRC (EP/I004165/1)
Nizhny Novgorod University (RNF/14-41-00044)
EU Marie-Curie ITN (H2020-MSCA-2014_ITN 643073 CRITICS)
EU Marie-Curie IRSES (FP7-PEOPLE-2012-IRSES 318999 BREUDS)
Dutsche Forschungsgemeinschaft (SFB Transregio 109)
Article History
Received: 4 June 2016
Accepted: 11 October 2018
First Online: 31 January 2019