Lakoba, T. I. http://orcid.org/0000-0002-1873-004X
Funding for this research was provided by:
Directorate for Mathematical and Physical Sciences (DMS-1217006)
Article History
Received: 5 April 2016
Revised: 9 December 2016
Accepted: 19 December 2016
First Online: 31 December 2016