1. Department of Mathematical Basics of Control, Moscow Institute of Physics and Technology (State University) , Dolgoprudny, Russia
2. Department of Mathematics, Ohio University , Athens, USA
3. Department of Mathematical Sciences, Durham University , UK
4. National Research University, Higher School of Economics , Moscow, Russia
5. Department of Mathematics and Statistics, University of North Carolina at Charlotte , USA
6. Department of Sociology, University of North Carolina at Charlotte , USA