1. Department of Finance and Research Center for Econophysics, East Chine University of Science and Technology, Shanghai, 200237China.
2. Department of Physics and Center for Polymer Studies, Boston University, Boston, MA, 02215USA.
3. Business School and Center for Finance and Investment Management, Hunan University, Changsha, 410082China.
4. Grupo de Física da Matéria Condensada, Núcleo de Ciências Exatas, Campus Arapiraca, Universidade Federal de Alagoas, 57309-005Arapiraca, AL, Brazil.
5. International Institute of Physics, Federal University of Rio Grande do Norte, 59070-405Natal, Brazil.
6. Faculty of Civil Engineering, University of Rijeka, 51000Rijeka, Croatia.
7. Zagreb School of Economics and Management, 10000Zagreb, Croatia.
8. Luxembourg School of Business, Luxembourg, EU.