@article{ruotsalo-et-al-signum-2008,
  OPTkey = 	 {},
  author = 	 {Tuukka Ruotsalo and Katri Seppälä and Kim Viljanen and Eetu Mäkelä and Jussi Kurki and Olli Alm and 
Tomi Kauppinen and Jouni Tuominen and Matias Frosterus and Reetta Sinkkilä and Eero Hyvönen},
  title = 	 {Ontology-­based Approach for Interoperability of Digital Collections},
  OPThowpublished = {},
   OPTURL = {http://www.seco.hut.fi/publications/2008/ruotsalo-et-al-signum-2008.pdf},
  OPTproject = {http://www.seco.hut.fi/projects/finnonto},
  
  journal = {Signum},
  number = 	 {5},
  year = 	 {2008},
  OPTannote = 	 {},
  OPTproject = {http://www.seco.tkk.fi/projects/sw20, http://www.seco.tkk.fi/projects/finnonto}
}