Bernhard Mitschang, Hamid Pirahesh, Peter Pistor, Bruce G. Lindsay, Norbert Südkamp. SQL/XNF - Processing Composite Objects as Abstractions over Relational Data. In Proceedings of the Ninth International Conference on Data Engineering, April 19-23, 1993, Vienna, Austria. pages 272-282, IEEE Computer Society, 1993. [doi]
Abstract is missing.