The knowledge retrieval matrix: codification and personification as separate strategies. - Jens Gammelgaard; Thomas Ritter (J. Knowl. Manag., 2005)

Virtual Communities Practice: A Mechanism for Efficient Knowledge Retrieval in MNC's. - Jens Gammelgaard; Thomas Ritter (Int. J. Knowl. Manag., 2008)

Knowledge retrieval through virtual communities of practice. - Jens Gammelgaard (Behav. Inf. Technol., 2010)