Regional accentors
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The two subspecies of Black-throated Accentor, from the Ural Mountains and in west Central Asia, are recommended to be split in a new paper, which also suggests that the Tibetan form of Alpine Accentor may potentially be a separate species.
Reference
Drovetski, S V, Semenov, G, Drovetskaya, S S, Fadeev, I V, Red'kin, Y A, and Voelker, G. (2013), Geographic mode of speciation in a mountain specialist Avian family endemic to the Palearctic. Ecology and Evolution doi: 10.1002/ece3.539.