Funding for this research was provided by:
Agency for Research and Development (APVV-14-0378)
VEGA Grant Agency (1/0319/15)
Engineering and Physical Sciences Research Council (EP/K037145/1)
National Science Foundation (DMS-1312926)
Article History
Received: 16 October 2017
Accepted: 19 April 2018
First Online: 25 April 2018