@incollection{Tholen.2005,
 author = {Tholen, Georg C.},
 title = {Medium/Medien},
 pages = {150-172},
 publisher = {Fink},
 isbn = {3770541715},
 editor = {Roesler, Alexander and Stiegler, Bernd},
 booktitle = {Grundbegriffe der Medientheorie},
 year = {2005},
 address = {Paderborn}
}