I've got a textbook here (Principles of Combustion, Kenneth K. Kuo, (C) 1986 John Wiley & Sons, Inc.)
page 484 refers to "statistical model of Bray and Moss":
As we learned before from the previous discussion on premixed turbulent flames, there are two alternative hypotheses regarding the physical structure of a premixed turbulent flame:
A) Wrinkled-Laminar-Flame ... [description]
B) Distributed-Reaction ... [description]
It seems likely that, in different circumstances, each of these alternative models may have a region of validity. The purpose of Bray and Moss's work is to create a unified description of the premixed turbulent flame, in order to define these regions of validity and to bridge the gaps between these two hypotheses.
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the above is followed by a somewhat lengthy discussion of the Bray - Moss model (about 9 pages).
If the Bray - Moss - Libby model is a modification of the aforementioned, you may have better luck finding info about it in an SAE paper or similar publication.