RCAAP - Repositório Científico de Acesso Aberto de PortugalOASISBR - Portal brasileiro de publicações científicas em acesso abertoLA Referencia - Rede
Directory of Open Access JournalsAfrican Journals OnLineSciELO – Scientific Electronic Library OnlinePLOS - Public Library of ScienceDove Medical Press (Taylor & Francis Group)PubMed Central
American Physical SocietyAmerican Institute of Physics (including Acoustical Society of America)American Society of Civil EngineersScienceDirect - Elsevier Publishing
Bill's List of Predatory Journals and PublishersList of Predatory JournalsPredatory Journals and Publishers: Is the Journal or Publisher Predatory?
HINARI - Access to Research for Health programmeAGORA - Access to Global Online Research in Agriculture
ScienceDirect (Avaliação da Colecção de Manuais Académicos - Textbooks)
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