Trapp, Sonja, Ervin Ramollari, Matthias Heintz, Sebastian Weber, Dimitris Dranidis, and Jürgen Börstler. 2011. “Collaborative Learning of UML and SysML”. International Journal of Engineering Pedagogy (iJEP) 1 (2):pp. 6-12. https://doi.org/10.3991/ijep.v1i2.1663.