\hypersetup{
  pdftitle={Controle para Automação},
  pdfsubject={Introdução},
  pdfauthor={Geovany A. Borges,
    Departamento de Engenharia Elétrica,
    Universidade de Brasília,
    <gaborges@ene.unb.br>},
  pdfkeywords={Controle de Sistemas},
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