Nicolas Tournadre and Hiroyuki Suzuki 2023
Zhongu, a Tibetic language not intelligible with the Tibetic languages listed in E16/E17/E18/E19/E20/E21/E22/E23/E24/E25/E26/E27, is missing from E16/E17/E18/E19/E20/E21/E22/E23/E24/E25/E26/E27 ( Sun, Tianshin Jackson 2003 ).
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