https://doi.org/10.1103/PhysRevLett.83.3370
Authors. Randall, L. & Sundrum, R.
Venue. Physical Review Letters
How the Institute flags it
speculative 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.