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\bibitem[{Della Penna et~al.}(2006){Della Penna, Di Marco, Intrigila, Melatti \& Pierantonio}]{DellaPenna_etal2006} Giuseppe Della Penna, Antinisca Di Marco, Benedetto Intrigila, Igor Melatti, and Alfonso Pierantonio. "Interoperability mapping from XML schemas to ER diagrams." \textit{Data Knowl. Eng.} 59, no. 1 (2006): 166--188. Elsevier Science Publishers B. V.. ISSN: 0169-023x. DOI: 10.1016/j.datak.2005.08.002.

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