I too have never searched for R or anything of that nature before. However, if you look closely you see some microdata that is being pulled in "Cited by 148 - R

I too have never searched for R or anything of that nature before. However, if you look closely you see some microdata that is being pulled in "Cited by 148 - Related articles". this is one reason why it is so high and is the actual basis for how PageRank works (the most cited papers/journals are those that are deemed higher quality).