@techreport{TR-DCC-93-13,
  number = {DCC-93-13},
  author = {Pires, M. Fátima and Medeiros, Claudia M. B. and Silva, Ardemiris B.},
  title = {Modelling Geographic Information Systems using an Object Oriented Framework},
  month = {June},
  year = {1993}, 
  institution = {Department of Computer Science, University of Campinas},
  note = {In English, 21 pages.
    \par\selectlanguage{english}\textbf{Abstract}
      Geographic information systems demand the processing of complex
      data using specialized operations, not available in traditional
      database systems.  Even though there exist commercial systems that
      provide some of these facilities, there is a lack of proper
      support, which should cover not only the implementation but also
      the design stage.  This paper answers this latter need, discussing
      the steps for modelling databases for geographic information
      systems using the paradigm of object orientation.
  }
}