https://www.nature.com/articles/s44284-026-00398-z
Authors. Raven et al
Venue. Nature Cities 3
How the Institute flags it
frontier 2 times 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.