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The article currently follows Bradley (1997)'s classification, grouping all tonal varieties of Tibetan (Ü-Tsang, Western Innovative, Southern, Khams) except some varieties of Khams into Central Tibetan. It seems that this classification has not been accepted by many. Thurgood (2003) and Tournadre (2005) still consider Central Tibetan, Western Innovative and Southern Tibetan to be separate branches of Tibetan. Bradley's "Northern" group (Nagqu and Nangqên) of Central Tibetan is also controversial. skal bzang 'gyur med et al. (2002) and Tournadre (2005) classify these varieties as part of Khams. The only consensus is that Ü-Tsang belongs to Central Tibetan. Daltac (talk) 08:09, 6 July 2012 (UTC)[reply]
That would probably take a lot of rewriting and two new pages (Western Innovative Tibetan and Southern Tibetan). I don't have the energy right now. Do you know other sources on the classification of Tibetan, especially sources after 2005 besides Tournadre (2008)