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Tiziana Catarci, Giuseppe Santucci, Michele Angelaccio. Fundamental Graphical Primitives for Visual Query Languages. Inf. Syst., 18(2):75-98, 1993.
Possibly Related PublicationsThe following publications are possibly variants of this publication: QBD*: A Graphical Query Language with RecursionMichele Angelaccio, Tiziana Catarci, Giuseppe Santucci. TSE, 16(10):1150-1163, 1990. [doi] On the Expressive Power of Graphical Query LanguagesTiziana Catarci. vdb 1992: 411-421
The following publications are possibly variants of this publication: