About this article
Published Online: May 18, 2018
Page range: 141 - 144
Received: Aug 10, 2017
Accepted: Jan 14, 2018
DOI: https://doi.org/10.1515/msp-2018-0003
Keywords
© 2018
This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 License.
Cao, Xian-Sheng
School of Mathematics and Physics, Changzhou University, 1 Gehu,Changzhou, China