@inproceedings{ls_leimeister, address = {Utrecht, Netherlands (accepted for publication)}, author = {Bitzer, Philipp and Söllner, Matthias}, booktitle = {European Conference on Information Systems (ECIS)}, interhash = {bc6ff6701f1e1673fa90aa643e1d00a6}, intrahash = {2b38076bc602a1a630b3aef8f0cc6215}, title = {Towards a Productivity Measurement Model for Technology Mediated Learning Services}, year = 2013 }