الإتاحة: http://repositorio.bc.ufg.br/handle/ri/11082Test
الإتاحة: https://doi.org/10.1590/S0080-62342012000100019Testhttp://repositorio.bc.ufg.br/handle/ri/16923Test
الإتاحة: https://doi.org/10.1590/S0104-07072011000300013Testhttp://repositorio.bc.ufg.br/handle/ri/16932Test