S. Blümling, and N. Reithinger. Proceedings of DeLFI Workshops 2015, co-located with 13th e-Learning Conference of the German Computer Society (DeLFI-15), Munich, Germany, volume 1443 of CEUR Workshop Proceedings, page 10--18. RWTH Aachen, Sun SITE Central Europe, (2015)
E. Arica, J. Strandhagen, and H. Hvolby. Advances in Production Management Systems: Innovative and Knowledge-Based Production Management in a Global-Local World (Part I), volume 438 of IFIP Advances in Information and Communication Technology, Springer, Heidelberg, (2014)