@MastersThesis{holi-a-method-for-modeling-uncertainty-2004,
  author = 	 {Markus Holi},
  title = 	 {A Method for Modeling Uncertainty in Semantic Web Ontologies},
  school = 	 {University of Helsinki},
  year = 	 {2004},
  OPTurl =       {http://www.seco.hut.fi/publications/2004/holi-a-method-for-modeling-uncertainty-2004.pdf}
}