Tiziana Catarci. On the Expressive Power of Graphical Query Languages. In Elöd Knuth, Lutz Michael Wegner, editors, Visual Database Systems, II. Proceedings of the IFIP TC2/WG 2.6 Second Working Conference on Visual Database Systems. Budapest, Hungary, 30 September - 3 October 1991. Volume A-7 of IFIP Transactions, pages 411-421, North-Holland, 1991.
Abstract is missing.