Abstract
The authors have retracted this article [1] because it significantly overlaps with the previously published article by Zhong and Huang [2]. All authors agree to this retraction.
Highlights
*Correspondence: yaoyonghong@aliyun.com 5Department of Mathematics, Tianjin Polytechnic University, Tianjin, China Full list of author information is available at the end of the article
Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations
Received: 28 March 2019 Accepted: 28 March 2019
Summary
*Correspondence: yaoyonghong@aliyun.com 5Department of Mathematics, Tianjin Polytechnic University, Tianjin, China Full list of author information is available at the end of the article
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