The German specialist lexicon. - Gesa Weske-Heck; Albrecht Zaiss; Matthias Zabel; Stefan Schulz 001; Wolfgang Giere; Michael Schopen; Rüdiger Klar (AMIA, 2002)

The MeSH Translation Maintenance System: Structure, Interface Design, and Implementation. - Stuart J. Nelson; Michael Schopen; Allan G. Savage; Jacque-Lynne A. Schulman; Natalie Arluk (MedInfo, 2004)