https://arxiv.org/abs/1601.05112
Authors. Ćirković, M. M
Venue. Serbian Astronomical Journal 191 , 1–15 — arXiv abstract page, partial text only
How the Institute flags it
frontier 1 time speculative 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.