1. Department of Research System and Science Dynamics, , , Germany E-mail: azeroual@dzhw.eu
2. Department of Computer Science, , , Germany E-mail: saake@ovgu.de
3. Department of Computer Science and Engineering, , , Germany E-mail: mohammad.abuosba@HTW-Berlin.de
4. , University of Lille, , France E-mail: joachim.schopfel@univ-lille.fr