A. Kittur, und R. Kraut. CSCW '08: Proceedings of the ACM 2008 conference on Computer supported cooperative work, Seite 37--46. New York, NY, USA, ACM, (2008)
E. Koumans, R. Johnson, J. Knapp, und M. Louis. Clinical Infectious Diseases: An Official Publication of the Infectious Diseases Society of America, 27 (5):
1171--1180(November 1998)PMID: 9827265.