Luoma-acho, V., M. Vos, R. Lappalainen, A. Lämsä, O. Uusitalo, P. Maaranen, and A. Koski. “Added Value of Intangibles for Organizational Innovation”. Human Technology, vol. 8, no. 1, May 2012, pp. 7–23, doi:10.17011/ht/urn.201205141650.