Concepts of the Enterprise Knowledge Medium. - Axel Röpnack; Martin Schindler; Thomas Schwan (PAKM, 1998)

Improving knowledge intensive processes through an enterprise knowledge medium. - Martin J. Eppler; Patrick M. Seifried; Axel Röpnack (SIGCPR, 1999)

The Need for Topological Time and Location Information in Mobile E-Business Applications. - Bernd Schopp; Axel Röpnack; Markus Greunz (PDP, 2001)