Schwendimann, B. A., B. De Wever, R. Hämäläinen, and A. A. P. Cattaneo. “The State-of-the-Art of Collaborative Technologies for Initial Vocational Education: A Systematic Literature Review”. International Journal for Research in Vocational Education and Training, vol. 5, no. 1, Apr. 2018, pp. 19-41, doi:10.13152/IJRVET.5.1.2.