Recommended Omaha Books?

Can anyone recommend any good Omaha Hi/Lo 8 or better books for someone who has recently started playing? I didn't notice any Omaha books listed on the homepage of this site. I'm sure this question has been asked before, but I'm new to the forum.

My initial goal is to be able to do well at the fixed limit and pot limit games online at lower limits. I'm doing fairly well at the $0.50-$1 fixed limit even though all I've read is the Omaha chapter in the Poker for Dummies book, but I'd like to get better so that I could move up in the limits or tackle pot limit.

I'm especially interested in any book with good discussions on the strategy differences between fixed limit and pot limit since I've never been in a pot limit game.

Thanks in advance,