http://sportsillustrated.cnn.com/200...lay/index.html
Here's one particularly interesting passage: "Every ref in America should read a study released in November by Indiana University's Kelley School of Business, which found that the larger the foul differential between two teams, the more likely any subsequent foul will be charged to the team with fewer fouls. In other words, because referees by nature want to even out foul totals, aggressive play pays."
Written by the always excellent Alexander Wolff and definitely worth a read.
And you may also enjoy the photo on page 1 of the article