Hello Vignesh,

In addition to what Erik suggested there are a lot of articles at the following link which you will find handy.

http://www.compliance-club.com/keith_armstrong.asp

Also, try searching for "Kai PCB" or "Kai Grounding" in the search box and you will get hits to lots of specific grounding issues discussed by Kai and other members on the forum itself.

hope this helps

regards
Ashish