@misc{cao07casestudy,
  author = {Cao, Yiwei and Ehms, Karsten and Fiedler, Sebastian and Hofer, Margit and Kaiamo, Anna-Kaarina and Kieslinger, Barbara and Klamma, Ralf and Krause, Beate and Kravcik, Milos and Ryyppö, Tommi and Spaniol, Marc and Stumme, Gerd and Wild, Fridolin},
  interhash = {96bc6617b9a6260a1bef2403d762f383},
  intrahash = {5dc735281a6be72a54186018e0166740},
  note = {Deliverable 15.2, European Network of Excellence ``Prolearn - Professional E-Learning''},
  title = {Case study on social software use in distributed working environments},
  url = {http://www.prolearn-project.org/deliverables/view?id=1432},
  year = 2007
}

@book{yin84,
  abstract = {This new edition of the best-selling Case Study Research has been carefully revised, updated, and expanded while retaining virtually all of the features and coverage of the Second Edition. Robert Yin's comprehensive presentation covers all aspects of the case study method--from problem definition, design, and data collection, to data analysis and composition and reporting. Yin also traces the uses and importance of case studies to a wide range of disciplines, from sociology, psychology and history to management, planning, social work, and education.},
  address = {Beverly Hills, CA},
  author = {Yin, Robert K.},
  interhash = {7f654abb2607cf3459fd90f618fb1cec},
  intrahash = {b4779f97dcab4a29935e5b9a36b4398b},
  publisher = {Sage Publications},
  series = {Applied social research methods series},
  title = {Case Study Research: Design and Methods},
  url = {http://www.amazon.ca/gp/product/0761925538/ref=wl_it_dp/702-0885532-1303250?ie=UTF8&coliid=I1NIZV3GVL8OUS&colid=1DVGN4EKR6AVM},
  year = 1984
}