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منبع فارسی برای مطالعه بیشتر
خزائی، سعید، پالايه ي علايم ضعيف: مانعي بر سر راه آينده نگاري، وبلاگ سید علیرضا حجازی: مقالات فنآوری اطلاعات و ارتباطات http://ictarticle.blogfa.com/post-80.aspx
http://ictarticle.blogfa.com/post-81.aspx
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