Funding for this research was provided by:
National Natural Science Foundation of China (11801153, 11901514, 11861072)
Applied Basic Research Foundation of Yunnan Province (2018FD085)
Applied Basic Research Key Project of Yunnan (2017FH001-013)
Honghe University Doctoral Research Programs (XJ17B11)
Yunnan Province Applied Basic Research for General Project (2019FB001)
Text and Data Mining valid from 2020-03-05
Received: 31 December 2019
Accepted: 27 February 2020
First Online: 5 March 2020
: The authors declare that they have no competing interests.
: All authors agree to publish this paper to Boundary Value Problems.