Rotstein, Horacio G. http://orcid.org/0000-0002-4387-5160
Funding for this research was provided by:
Division of Mathematical Sciences (NSF DMS-1313861)
National Science Foundation (DMS-1608077)
Article History
Received: 2 December 2016
Revised: 9 March 2017
Accepted: 18 April 2017
First Online: 31 May 2017
Compliance with Ethical Standards
:
: The author declares that he has no conflict of interest.