DuckDuckGo Architecture

http://highscalability.com/blog/2013/1/28/duckduckgo-architecture-1-million-deep-searches-a-day-and-gr.html

Using Something You Can’t Implement Yourself

http://blogs.microsoft.co.il/blogs/sasha/archive/2013/01/30/using-something-you-can-t-implement-yourself.aspx

How to implement an algorithm from a scientific paper

http://codecapsule.com/2012/01/18/how-to-implement-a-paper/