Legal and Organizational Issues in Collaborative User-Created Content. - Risto Sarvas; Marko Turpeinen; Perttu Virtanen; Herkko Hietanen; Fernando Herrera (DiGRA Conference, 2005)

Legal research topics in user-centric services. - Olli Pitkänen; Perttu Virtanen; Jukka Kemppinen (IBM Syst. J., 2008)

Poem title list III -A little database outro. - Perttu Virtanen (Eur. J. Law Technol., 2011)

Innoweb v Wegener: CJEU, Sui Generis database right and making available to the public - The war against the machines. - Perttu Virtanen (Eur. J. Law Technol., 2014)