1. Division of Science and Technology, Beijing Normal University–Hong Kong Baptist University United International College, Zhuhai, China
2. Université et Unité de Mécanique de Lille EA, Villeneuve d’Ascq, France
3. Department of Mathematics, City University of Hong Kong, Kowloon, Hong Kong; Department of Materials Science and Engineering, City University of Hong Kong, Kowloon, Hong Kong
4. Department of Mathematics, City University of Hong Kong, Kowloon, Hong Kong