Authors
Shuai Yuan
1School of Mathematics and Statistics, HNP-LAMA, Central South University, 2.Department of Mathematics, University of Craiova, 3.China-Romania Research Center in Applied Mathematics, Craiova
Yuning Gao
Department of Material Enginering, Hebei Vocational University of Industry and Technology, Ovidius University of Constanta, P.R.China