Liang, Mingjie
Wu, Bingyao http://orcid.org/0000-0003-4734-2772
Funding for this research was provided by:
National Science Foundation of Fujian Province (2017J01567)
Science Foundation of the Education Department of Fujian Province (JA15476)
the Program for Fujian Normal University Innovation Team “Probability and Statistics: Theory and Application” (IRTL1704)
Article History
Received: 17 April 2018
Accepted: 31 July 2018
First Online: 8 August 2018
Competing interests
: The authors declare that they have no competing interests.