https://learnsanskrit.wordpress.com/2008/06/28/%e0%a4%b8%e0%a4%ae%e0%a4%be%e0%a4%b8%e0%a4%be%e0%a4%a8%e0%a4%be%e0%a4%82-%e0%a4%aa%e0%a4%b0%e0%a4%bf%e0%a4%9a%e0%a4%af%e0%a4%83-introduction-to-samas-compounds/