M. Freitag, S. Lamberth, S. Klingner, and M. Böttcher. RESER 2011 Productivity of Services NextGen - Beyond Output/Input. Programme and Abstracts., page 63-64. (8th-9th 09 2011)
M. Freitag, S. Lamberth, S. Klingner, and M. Böttcher. RESER 2011 Productivity of Services NextGen - Beyond Output/Input. Programme and Abstracts., page 63-64. (8th-9th 09 2011)