Gu, Haibo
Sun, Yu
Funding for this research was provided by:
Scientific Research Programs of Colleges in Xinjiang (XJEDU2018Y033)
Natural Science Foundation of Xinjiang (2019D01A71, 2018D01A27)
National Natural Science Foundation of China (11961069)
Mathematics Key Subject of Xinjiang Normal University (17SDKD1106)
Article History
Received: 12 August 2019
Accepted: 28 February 2020
First Online: 10 March 2020
Competing interests
: The authors declare that they have no competing interest.