الإتاحة: http://www.teses.usp.br/teses/disponiveis/55/55134/tde-21092017-165153Test/
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الإتاحة: https://doi.org/10.11606/D.55.2017.tde-21092017-165153Testhttp://www.teses.usp.br/teses/disponiveis/55/55134/tde-21092017-165153Test/