1. Vienna University of Economics and Business, Vienna, Austria. E-mails: javier.fernandez@wu.ac.at, juergen.umbrich@wu.ac.at, axel.polleres@wu.ac.at
2. Complexity Science Hub Vienna, Austria
3. Stanford University, USA
4. AKSW/KILT, Leipzig University, Leipzig, Germany. E-mail: knuth@informatik.uni-leipzig.de