Martin L. Kersten Hans Weigand Frank Dignum J. Boom A Conceptual Modelling Expert System. 35-48 1986 ER db/conf/er/er86.html#KerstenWDB86 conf/er/86 er86/ER86-P035.pdf db/conf/er/KerstenWDB86.html ... conf/vldb/BouzeghoubGM85 books/el/Ceri83 journals/tods/Chen76 conf/vldb/DadamLW84 journals/is/AntonellisL85 ... ... ... conf/vldb/LeonardL81 ... journals/tods/SmithS77 ... ... journals/cacm/Weizenbaum83 ... ... ...