@unpublished{Naumann:2002a,
  author	= {Naumann, Karin},
  title		= {Synchronous communication in a virtual classroom. {E}ingeladener {V}ortrag, 1st {I}nternational {I}{LIAS} conference, {H}amburg 5th and 6th {S}eptember},
  year		= {2002},
  URL		= {/projects/milca/Publikationen/Ilias_CMC.ps}
}