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           | DescriptionUser demography.tif | 
           
             English: Estimation of users contribution from different regions to different Wikipedia editions. 
            فارسی: تخمین میزان مشارکت کاربران از مناطق مختلف جهان در نسخهها (زبانها)ی مختلف ویکیپدیا 
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           | Date | 
           23 January 2012 | 
          
          
           | Source | 
            http://www.plosone.org/article/info%3Adoi%2F10.1371%2Fjournal.pone.0030091 | 
          
          
           | Author | 
           Taha Yasseri, Robert Sumi, János Kertész | 
          
         
         
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