Umweltdaten im Internet - Aufbau eines öffentlichen WWW-Servers. - Ralf Kramer; Ralf Nikolai; Horst Spandl (EMISA, 1996)

Accessing Multilingual, Heterogeneous Data Sources in Wide Area Networks - Requirements and Approach. - Ralf Kramer; Ralf Nikolai (FQAS, 1996)

Interoperability Issues of the European Catalogue of Data Sources (CDS). - Ralf Kramer; Ralf Nikolai; Claudia Rolker; Sigfus Bjarnason; Stefan Jensen (MD, 1997)

The Network as a Global Database: Challenges of Interoperability, Proactivity, Interactiveness, Legacy. - Peter C. Lockemann; Ulrike Kölsch; Arne Koschel; Ralf Kramer; Ralf Nikolai; Mechtild Wallrath; Hans-Dirk Walter (VLDB, 1997)

Thesaurus Federations: Loosely Integrated Thesauri for Document Retrieval in Networks Based on Internet Technologies. - Ralf Kramer; Ralf Nikolai; Corinna Habeck (Int. J. Digit. Libr., 1997)

WWW-UDK: A Web-based Environmental Meta-Information System. - Ralf Kramer; Ralf Nikolai; Arne Koschel; Claudia Rolker; Peter C. Lockemann; Andree Keitel; Rudolf Legat; Konrad Zirm (SIGMOD Rec., 1997)

Thesaurus Federations: A Framework for the Flexible Integration of Heterogeneous, Autonomous Thesauri. - Ralf Nikolai; A. Traupe; Ralf Kramer (ADL, 1998)

Interoperabilität Web-basierter Umweltkatalogsysteme. - Ralf Kramer; Wassili Kazakos; Arne Koschel; Ralf Nikolai; Claudia Rolker (Workshop Integration heterogener Softwaresysteme, 1998)

WebCDS - A Java-based Catalogue System for European Environment Data. - Wassili Kazakos; Ralf Kramer; Ralf Nikolai; Claudia Rolker; Sigfus Bjarnason; Stefan Jensen (IADT, 1998)

Multidimensional Access to European Environmental Data. - Wassili Kazakos; Ralf Kramer; Ralf Nikolai; Dimitri Nikolaidis (DEXA Workshop, 1999)

GenThes: A General Thesaurus Browser for Web-based Catalogue Systems. - Ralf Nikolai; Ralf Kramer; Marc Steinhaus; Bruno Felluga; Paolo Plini (MD, 1999)

The UDK Approach: the 4th Generation of an Environmental Data Catalogue Introduced in Austria and Germany. - Walter Swoboda; Fred Kruse; Ralf Nikolai; Wassili Kazakos; Detlev Nyhuis; Holger Rousselle (MD, 1999)

Integrating Workflow and Groupware Functionalities for Co-operating Small and Medium Sized Enterprises: A Case Study. - Gábor Nagypál; Florian Fischer; Udo Straub; Peter Weiß; Ralf Nikolai (CRIWG, 2001)

Thesaurusföderationen: ein Rahmenwerk für die flexible Integration von heterogenen, autonomen Thesauri. - Ralf Nikolai (Logos-Verlag, 2002)