Funding for this research was provided by:
National Science Foundation (NSF-DMS-1206438)
National Science Foundation (NSF-DMA-1109784)
Research Fund of the Indiana University
Conselho Nacional de Desenvolvimento Científico e Tecnológico (303654/2013-9)
Conselho Nacional de Desenvolvimento Científico e Tecnológico (200826/2014-0)
Conselho Nacional de Desenvolvimento Científico e Tecnológico (490124/2009-7)
Article History
Received: 28 October 2016
First Online: 2 January 2019