[Gaohang Yu] School of Mathematics and Computer Sciences, Gannan Normal University, Ganzhou 341000, China
[Li Zhang] Department of Mathematics, Changsha University of Science and Technology, Changsha 410004, China
[Yunhai Xiao] College of Mathematics and Information Science, Henan University, Kaifeng 475000, China
[Neculai Andrei] Research Institute for Informatics (ICI), 8-10 Averescu Avenue, 71316 Bucharest 1, Romania
[Gonglin Yuan] College of Mathematics and Information Science, Guangxi University, Nanning, Guangxi 530004, China
