https://www.frontiersin.org/journals/earth-science/articles/10.3389/feart.2020.533498/pdf
Authors. Velazquez, O.; Pescaroli, G.; Cremen, G.; Galasso, C
Venue. Frontiers in Earth Science 8:533498, PDF edition
How the Institute flags it
established 1 time 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.