Here in NZ CBT and chronic pain are covered in our training. So guess we are lucky in that regard. As far as articles go I can't think of any off the top of my head, I just use it as required. Mckenzie is brilliant and does have a fantastic method for involving the patient and using minimal force required. If your looking for information on graded exposure and graded activity then I suggest you research into david butler and laurimer mosely's work. They are brilliant with their chronic pain and have alot of info. Books such as explain pain are a good referance.