I've seen tons of articles/posts about this recently, but does anyone have any links to any good articles that describe the patent(s) in question, and what the arguments are about (a) whether this patent is truly novel (I've heard tons of "pulse oximetry is decades old" arguments, but nothing about the specifics of these patents) and (b) whether Apple is or isn't infringing on the specific details?

I'm sure this kind of analysis must be out there, but I searched through a couple of posts and lots of comment threads and primarily saw a lot of conjecture but no actual references to what was really under debate.