LOL There are tons of articles and research on clutch out there. Is there a reason why you have not searched yourself? When I look for these types of things, I typically stick with the baseball saber guys, like Bill James, Tom Tango, Mitchell Lichtman, Fangraphs, Baseball Prospectus, and The Hardball Times.
Here's a good article on clutch hitting from Fangraphs with links to research:
http://www.fangraphs.com/library/considering-high-leverage-performance-and-clutch-hitting/
And here is a link to a site containing links to clutch hitting research and articles:
http://cyrilmorong.com/ClutchLinks2.htm