| Affiliation: | 1. Departamento de Matemáticas, CINVESTAV, Apartado Postal 14-740, C.P. 07000, México, D.F., Mexico;2. Departamento de Matemáticas, Universidad de los Andes, Carrera 1 N. 18A - 10, Bogotá, Colombia;3. Departamento de Matemáticas y Estadística, Universidad del Norte, Km 5 via Puerto Colombia, Barranquilla, Colombia;1. Department of Mathematics, Jinan University, Guangzhou 510632, China;2. Department of Optoelectronic Engineering, Jinan University, Guangzhou 510632, China;1. Department of Physics, University of the Chinese Academy of Sciences, YuQuan Road 19A, 100049, Beijing, China;2. Department of physics, Southern University of Science and Technology, 1088 Xueyuan Avenue, 518055 Shenzhen, China |
