1. Institute of Computational Science and Technology, Ho Chi Minh city, Vietnam
2. Mathematics and Computer Science Division, Gran Sasso Science Institute, L’Aquila, Italy
3. Institute for Numerical and Applied Mathematics, University of Goettingen, Goettingen, Germany
4. Department of Electrical, Electronic, and Control Engineering, Hankyong National University, Gyeonggi, Republic of Korea
5. Department of Mathematics, University of Hamburg, Hamburg, Germany
6. Department of Mathematics and Statistics, University of Helsinki, Helsinki, Finland