Funding for this research was provided by:
National Science Foundation (DMS-1265868, DMS-1600942)
Japan Society for the Promotion of Science (JSPS KAKENHI, Scientific Research (S) 23224003, JSPS KAKENHI, Grant-in-Aid for Young Scientists (B) 2474010)
National Science Foundation (DMS-1400706, DMS-1500707)
Article History
Received: 10 February 2017
Accepted: 5 June 2017
First Online: 15 June 2017
Free to read: This content has been made available to all.