You should be able to order a copy of Prof. Jull’s paper by calling (520) 881-0857 or emailing firstname.lastname@example.org. I think the cost is $40.00. If you have access to a university library or you know someone in academia, they may be able to get a copy.
As for Mark Oxley’s paper, is is available at Shroud.com at the following link:
Frankly, I’d start with Mark’s paper.