author = "Paulo Carreira and Ant{\'o}nia Lopes and Helena Galhardas and Jo{\~a}o Carlos Serrenho Dias Pereira",
   title = "Extending the Relational Algebra with the Mapper Operator",
   institution = "INESC-ID",
   number = 1,
   year = 2005,
   month = jan,
   BibTexOrigem = "2322 www.Inesc-ID.pt 2019-07-20"

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