There has been some discussion (in Chinese) on the HKBWS China programme webpage on the recent taxonomy change/split of the Dusky Warbler complex. That involves Smoky Warbler, Tickell's Warbler, Dusky Warbler, Yellow-streaked Warbler and Buff-throated Warbler. The paper by J Martens et al is the main reference.
http://www.chinabirdnet.org/BBS/ ... &extra=page%3D1
HF Cheung