Obstacles to usability evaluation in practice: a survey of software development organizations. - Jakob Otkjær Bak; Kim Nguyen; Peter Risgaard; Jan Stage (NordiCHI, 2008)

Bringing Usability Evaluation into Practice: Field Studies in Two Software Organization. - Jakob Otkjær Bak; Kim Nguyen; Peter Risgaard; Jan Stage (I-USED, 2009)