https://blog.nipunadodan.com/railstories/2013/01/14/%e0%b7%81%e0%b7%8a%e2%80%8d%e0%b6%bb%e0%b7%93-%e0%b6%bd%e0%b6%82%e0%b6%9a%e0%b7%8f%e0%b7%80%e0%b7%9a-emd-%e0%b7%80%e0%b6%82%e0%b7%81-%e0%b6%9a%e0%b6%ad%e0%b7%8f%e0%b7%80/