1. Scientific and Educational Mathematical Center “Mathematics of Future Technologies,” Lobachevsky State University of Nizhny Novgorod, 23 Gagarina Ave., 603950 Nizhny Novgorod, Russia
2. National Research University Higher School of Economics, 25/12 Bolshaya Pecherskaya Ulitsa, 603155 Nizhny Novgorod, Russia
3. Imperial College London, London, United Kingdom
4. Neuroscience Institute and Department of Mathematics and Statistics, Georgia State University, 100 Piedmont Ave., Atlanta, Georgia 30303, USA