https://www.dpgross.com/papers/america-jump-started-wwii.pdf
Authors. Gross, D. P. & Sampat, B. N
Venue. author-hosted PDF of the American Economic Review article
How the Institute flags it
established 2 times frontier 1 time
This source carries more than one flag across the corpus. That is not an inconsistency to resolve: the same work can be established evidence for one claim and frontier evidence for another, and the flag belongs to the use rather than to the source.