[1
]College of Science, Harbin Engineering University, Harbin 150001, People’s Republic
of China
[2
]College of Automation, Harbin Engineering University, Harbin 150001, People’s Republic
of China
[3
]The Institute of Mathematical Sciences, The Chinese University of Hong Kong, Shatin,
N.T., Hong Kong
[4
]Department of Mathematics, University of Texas, Arlington, Texas 76019, USA
[5
]Department of Mathematics, Cape Breton University, Sydney, Nova Scotia B1P 6L2, Canada