NBA Ref's and Racial Bias??

so a study was released that between 1991 through 2004 that White Ref's called more fouls against Black Players and that Black Ref's called more fouls against White Players. this is so lame because the League has 72 percent African-American. and where is the Proof and who are the ref's?? now if this was Baseball or a Sport where the sport was less African-American partcipants then this might actually carry some weight. if say the NBA was more White that incident with Joey Crawford and Tim Duncan might raise some eye-brows,but there may be some truth in there,but the actual finding is hard to truly Prove. now there is obvious Favortism. with SuperStars getting more calls and it also plays better for Tv Ratings,etc... but this story from the New York times is just a bad joke and a Insult to all Ref's.