Matts Ahlsen Alessandro D'Atri Paul Johannesson Els Laenens Nicola Leone Pasquale Rullo P. Rossi François Staes Laura Tarantino L. Van Beirendonck L. Van Cadsand W. Van Santvliet J. Vanslembrouck Brigitte Verdonk Dirk Vermeir The KIWIS Knowledge Base Management System. 79-97 1991 CAiSE db/conf/caise/caise91.html#AhlsenDJLLRRSTBCSVVV91 http://dx.doi.org/10.1007/3-540-54059-8_81