Any research on the authorship of the Avatamsaka Suttra?

I was reading through the sutra (well, using global search in my kindle) to find references to the word mathematics. In at least two places the author suggests Bodhisattvas should study all manners of topics to be of benefit to others, including mathematics. And in at least two places, the text goes on and on naming extremely large numbers and describing how to calculate them using powers of ten. These chapters seem to have been written by the same guy-- an interest in large numbers and their application to Buddhism can't be that common. The last chapter, the Gaṇḍavyūha, even wikipedia says it used to be a suttra separate from the rest of the book.