1. Normandie University, INSA de Rouen Normandie, LMI (EA 3226 - FR CNRS 3335), 76000 Rouen, France
2. School of Mathematics and Statistics, Shandong University, Weihai, Weihai 264209, China & LAMA, Univ Gustave Eiffel, UPEM, Univ Paris Est Creteil, CNRS, 77447 Marne-la-Vallée, France
3. Aalto University, Department of Mathematics and Systems Analysis, PO Box 11100 (Otakaari 1, Espoo), 00076 Aalto, Finland