Funding for this research was provided by:
National Science Foundation (NSF-DMS-1009102)
Italian Agency (PRIN 2010 Calculus of Variations)
DFG Collaborative Research Center (TRR 109 Discretization in Geometry and Dynamics)
Article History
Received: 20 April 2016
Accepted: 23 August 2016
First Online: 3 September 2016