https://doi.org/10.1002/2016gl069688
Authors. Colgan, W., Machguth, H., MacFerrin, M., Colgan, J., van As, D., MacGregor, J
Venue. Geophysical Research Letters
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.