Funding for this research was provided by:
Deutsche Forschungsgemeinschaft (SFB/Transregio 109: Discretization in Geometry and Dynamics, SFB/Transregio 109: Discretization in Geometry and Dynamics)
Austrian Science Fund (SFB/Transregio 109: Discretization in Geometry and Dynamics, Grant I 2978-N35)
Article History
Received: 27 February 2018
Revised: 18 April 2019
Accepted: 8 May 2019
First Online: 28 May 2019