Rethinking the Long Tail Theory: How to Define 'Hits' and 'Niches'

http://knowledge.wharton.upenn.edu/article/rethinking-the-long-tail-theory-how-to-define-hits-and-niches/

 The Economist - The long tail

http://www.economist.com/node/12762429

The Wrong Tail 

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 How to turn a powerful idea into a dubious theory of everything.

http://www.slate.com/articles/arts/books/2006/07/the_wrong_tail.html

Illustrating the Long Tail

https://moz.com/blog/illustrating-the-long-tail

Sizing Up the Long Tail 

http://www.experian.com/marketing-services/marketing-services.html