1. Institute for Computational and Applied Mathematics, University of Münster, Einsteinstrasse 62, 48149 Münster, Germany
2. University of Texas at Austin, 1 University Station, C120, Austin, TX 78712-1082, USA
3. Computer, Electrical and Mathematical Sciences and Engineering Division, 4700 King Abdullah University of Science and Technology, Thuwal 23955-6900, Kingdom of Saudi Arabia
4. Department of Mathematics, University of Vienna, Nordbergstrasse 15, 1090 Vienna, Austria