The External Intelligent Infrastructure. - Dag Karlsen; Frank M. Lillehagen; Dag Runar Elvekrok (PRO-VE, 2003)

The EXTERNAL intelligent infrastructure. - Dag Karlsen; Frank M. Lillehagen; Stefano Tinella (CE, 2003)

From enterprise modelling to enterprise visual scenes. - Frank M. Lillehagen; John Krogstie; Stefano Tinella; Helge Grenager Solheim; Dag Karlsen (CE, 2003)

Model driven operational solution. - Stefano Tinella; Dag Karlsen; Frank M. Lillehagen; M. W. Smith (CE, 2003)

The EXTERNAL Experience on System and Enterprise Integration. - Weigang Wang; Frank M. Lillehagen; Dag Karlsen; Svein G. Johnsen; John Krogstie; Jessica Rubart; Jörg M. Haake (Metainformatics, 2003)

Collaborative Modelling and Metamodelling with the Enterprise Knowledge Architecture. - Håvard D. Jørgensen; Frank M. Lillehagen; Dag Karlsen (Enterp. Model. Inf. Syst. Archit. Int. J. Concept. Model., 2005)

Product Based Interoperability - Approaches and Requirements. - Håvard D. Jørgensen; Dag Karlsen; Frank M. Lillehagen (CCE, 2007)

Integrating Requirement and Solution Modelling: Approach and Experiences. - Anders Carstensen; Lennart Holmberg; Per Högberg; Svein G. Johnsen; Dag Karlsen; Frank M. Lillehagen; Kurt Sandkuhl; Janis Stirna (EMMSAD, 2007)

The ATHENA Interoperability Framework. - Arne-Jørgen Berre; Brian Elvesæter; Nicolas Figay; Claudia Guglielmina; Svein G. Johnsen; Dag Karlsen; Thomas Knothe; Sonia Lippe (IESA, 2007)