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Aßfalg, R.; Hammwöhner, R.; Rittberger, M.: ¬The hypertext Internet connection : E-mail, online search, Gopher (1993)
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Rittberger, M.: Support of online database selection in KHS (1994)
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Rittberger, M.; Rittberger, W.: Measuring quality in the production of databases (1997)
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