Data and Knowledge: Proceedings of the Second Ifip 2.6 Working Conference on Database Semantics, "Data and Knowledge" (Ds-2), Albufeira, Portugal, 3-7 November, L986 by Portugal) IFIP 2.6 Working Conference on Database Semantics "Data and Knowledge" (2nd : 1986 : Albufeira | Menrva Books | MenrvaBooks