دسترسی به سایت های آزاد کتاب،مقاله، پایان نامه

 

https://extern.ir/book

https://journals.plos.org/plosone

https://ieeexplore.ieee.org/xpl/RecentIssue.jsp?punumber=6287639

https://doaj.org/

https://paperity.org/

https://core.ac.uk/

https://www.ncbi.nlm.nih.gov/pmc/

https://oatd.org/

https://www.dart-europe.org/basic-search.php

https://www.openaire.eu/

https://www.europeana.eu/en

https://network.bepress.com/

https://www.slideshare.net/

https://ganj.irandoc.ac.ir/

https://maktabkhooneh.org/

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