Ji, Hao http://orcid.org/0000-0003-0887-6106
Müller, Hans-Georg
Papadopoulos, Nikos T.
Carey, James R.
Funding for this research was provided by:
Division of Mathematical Sciences (1104426, 1407852)
Article History
Received: 8 August 2015
Revised: 19 January 2017
First Online: 17 February 2017