M. Becker, S. Klingner, и M. Böttcher. Proceedings of the Federated Conference on Computer Science and Information Systems, стр. 505--512. Szczecin, Poland, (18--21 09 2011)
M. Becker, M. Böttcher, и S. Klingner. RESER 2011 Productivity of Services NextGen - Beyond Output / Input. Programme and Abstracts, стр. 183--184. (8th/9th 09 2011)
M. Becker, S. Klingner, и M. Böttcher. RESER 2011 Productivity of Services NextGen - Beyond Output / Input. Programme and Abstracts, стр. 144--145. (8th/9th 09 2011)