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2. International DOI Foundation [Internet]. Key Facts on Digital Object identifier System. Disponível em: http://www.doi.org/factsheets/DOIKeyFacts.html. Acesso em: 23 abr. 2014.
3. Conselho Nacional de Desenvolvimento Científico e Tecnológico. CNPq firma contrato para certificar artigos publicados. Disponível em: http://memoria.cnpq.br/saladeimprensa/destaque_mes/2007/jun_2.htm. Acesso em 23 abr. 2014.