1. Department of Mathematics, Technion – Israel Institute of Technology, Haifa, Israel
2. Key Laboratory of High Performance Computing and Stochastic Information Processing (HPCSIP) (Ministry of Education of China), School of Mathematics and Statistics, Hunan Normal University, Changsha, Hunan, People's Republic of China
3. Department of Mathematics and Systems Analysis, Aalto University, Aalto, Finland
4. Guangdong Technion – Israel Institute of Technology, Shantou, Guangdong, People's Republic of China