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Remember that a good part of the academic documentation is freely available: here is a list of search engines for open access repositories, and here a list of french repositories. Hal portal contains numerous references (articles, conferences, theses...) déposited by authors. GoogleScholar search engine allows you to search multiples sources, many of which offer a free access to documents.
Books and articles not subjected to copyright restriction may have been digitized by Gallica or other free ebooks platform. A list here.