Electronic Market: The Roadmap for University Libraries and Members to Survive in the Information Jungle. - Michael Christoffel; Sebastian Pulkowski; Bethina Schmitt; Peter C. Lockemann (SIGMOD Rec., 1998)

A Trader for Services in a Scientific Literature Market. - Michael Christoffel (EFIS, 1999)

UniCats: ein System zum Beherrschen der Dienstevielfalt im Bereich der wissenschaftlichen Literaturrecherche (UniCats: A System for Managing the Information Market of Scientific Literature). - Bethina Schmitt; Sebastian Pulkowski; Michael Christoffel; Peter C. Lockemann (Informationstechnik Tech. Inform., 2000)

Trader-Supported Information Markets - A Simulation Study. - Michael Christoffel; Thorwald Franke; Stefan Kotkamp (EC-Web, 2001)

Semi-Automatic Wrapper Generation and Adaption: Living with Heterogeneity in a Market Environment. - Michael Christoffel; Bethina Schmitt; Jürgen Schneider (ICEIS, 2002)

Accessing Libraries as Easy as a Game. - Michael Christoffel; Bethina Schmitt (Visual Interfaces to Digital Libraries, 2002)

ExWrap: semi-automatic wrapper generation by example. - Bethina Schmitt; Michael Christoffel; Jürgen Schneider (SIGIR, 2002)

An Agent-oriented Approach to the Integration of Information Sources. - Michael Christoffel; Guido Wojke; Sebastian Werner; Rina Rezek; Su Xu (J. Web Eng., 2005)