1. Department of Economic Mathematic Modelling, Peoples ’Friendship University of Russia (Rudn University), Moscow, Russia
2. V.a. Trapeznikov Institute of Control Sciences, Russian Academy of Sciences, Moscow, Russia
3. Laboratory for Gas, Technology, and Sustainable Development, Peoples ’Friendship University of Russia (Rudn University), Moscow, Russia
4. Davis Center for Russian and Eurasian Studies, Harvard University, Cambridge, USA