Schubert, C.; Kinkeldey, C.; Reich, H.: Handbuch Datenbankanwendung zur Wissensrepräsentation im Verbundprojekt DeCOVER (2006)
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- Source
- http://www.eftas.com/www.de_cover.de/Nutzer/Sonstiges/tutorial_db-wr_v3.1.pdf
