Only Knowing with Confidence Levels: Reductions and Complexity. - Espen H. Lian; Tore Langholm; Arild Waaler (JELIA, 2004)

Default Reasoning with Preference Within Only Knowing Logic. - Iselin Engan; Tore Langholm; Espen H. Lian; Arild Waaler (LPNMR, 2005)

Only knowing with degrees of confidence. - Arild Waaler; Johan W. Klüwer; Tore Langholm; Espen H. Lian (J. Appl. Log., 2007)

Computing Default Extensions by Reductions on OR. - Espen H. Lian; Arild Waaler (KR, 2008)

An Only Knowing Approach to Defeasible Description Logics (Extended Abstract). - Espen H. Lian; Arild Waaler (Description Logics, 2009)

Confluent Term Rewriting for Only-knowing Logics. - Espen H. Lian; Einar Broch Johnsen; Arild Waaler (STAIRS, 2010)

Publishing the Norwegian Petroleum Directorate's FactPages as Semantic Web Data. - Martin G. Skjæveland; Espen H. Lian; Ian Horrocks 001 (ISWC (2), 2013)

Engineering ontology-based access to real-world data sources. - Martin G. Skjæveland; Martin Giese; Dag Hovland; Espen H. Lian; Arild Waaler (J. Web Semant., 2015)