https://www.cv.nrao.edu/~hliszt/RFI/SolarPower-SPS/NRC-1981ElectricPowerFromOrbit.pdf
Authors. National Research Council
Venue. — third-party PDF hosted by NRAO
How the Institute flags it
frontier 1 time established 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.