[jean_claude]

It's just not always possible to do that. I know it can be frustrating to not have ready access to academic journals, but you can usually find the article one way or another. Many journals are allowing pre-print publications to reside on open-access archives ( https://en.wikipedia.org/wiki/List_of_academic_journals_by_p... ), some will allow 'limited' distribution of either pre-print or published papers (generally means you have to ask the author for a PDF directly), and, with apologies to John Gilmore, the internet interprets copyright as damage and routes around it.