Maia, Rúbson, Vidal, Maria, Vale, Victor, Pereira, Alexandre, Rocha, Luzianny, Abreu Júnior, Pedro, Aragão, Raimundo, Ávila, Francisco, Loureiro, Joisa, Melo, Juliana, Pereira, Cieusa, AND Aguiar Júnior, Paulo. " Theses and Dissertations" Mercator [Online], Volume 4 Number 8 (19 November 2008)