@article{Koehler2003,
  author    = {K{\"o}hler, Thomas},
  title     = {Teaching and learning approaches in virtual learning environments},
  year      = {2003},
  language  = {en}
}
@article{KoehlerSchilde2003,
  author    = {K{\"o}hler, Thomas and Schilde, Patrick},
  title     = {From project teams to a virtual organization : the case of the education portal thuringia},
  isbn      = {9521509619},
  year      = {2003},
  language  = {en}
}
@article{LattemannKoehler2008,
  author    = {Lattemann, Christoph and K{\"o}hler, Thomas},
  title     = {Trust or control : governance concepts for virtual organizations},
  year      = {2008},
  language  = {en}
}