https://www.nature.com/articles/s42949-026-00394-1
Authors. Moghaddam & Cao
Venue. npj Urban Sustainability
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.