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There are two cases, - Either there is a direct link as shown in the first 2 papers. so you try to find it on http://gen.lib.rus.ec/ - Either you must look for it on google, you may find it. Sometimes these papers are chapter in books, so you can search the libgen.org site. (see this video for more information https://www.youtube.com/watch?v=xx_1csHT8lY) This solution does not work 100% so hope it can help. If you have any questions, email us on the facebook page: https://www.facebook.com/pages/T%C3%A9l%C3%A9charger-les-articles-scientifiques-gratuitement/218224654926008