Funding for this research was provided by:
National Science Foundation (DMS 1613375)
Directorate for Mathematical and Physical Sciences (DMS1522267, 1817542)
National Science Foundation (CBET 1609120)
Article History
Accepted: 19 March 2019
First Online: 15 April 2019
Compliance with ethical standards
:
: The authors declare that they have no conflicts of interest.