Try searching on this peer reviewed documents website: Wiley Online Library
After initiating a search by placing key words in the search field, look for the documents marked "Free Access" unless you are willing to pay for documents. About 1 in 10 are free to read and download in their entirety.
This paper is cited in a few studies on FFA... not sure it helps.
https://onlinelibrary.wiley.com/doi/epdf/10.1002/j.2050-0416.1984.tb04282.x
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