Author details

Qinlong Wang<sup>1</sup> \*, Bo Sang<sup>2</sup> and Wentao Huang<sup>1</sup>

\*Address all correspondence to: wqinlong@163.com

1 School of Science, Hezhou University, Hezhou, P.R. China

2 School of Mathematical Sciences, Liaocheng University, Liaocheng, P.R. China
