Affiliation: | 1. College of Mathematics and Software Science,Sichuan Normal University,Chengdu 610066,P.R.China 2. Department of Applied Mathematics,National Sun Yat-sen University, Kaohsiung 82424,Taiwan,P.R.China;Department of Leisure,Recreation and Tourism Management,Shu-Te University,Kaohsiung 82445,Taiwan,P.R.China 3. Department of Applied Mathematics,National Sun Yat-sen University, Kaohsiung 82424,Taiwan,P.R.China |