比德真
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[sửa]比德真 (**pitəgčin/**bitəgčin)
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[sửa]- Shimunek, Andrew (2017) Languages of Ancient Southern Mongolia and North China: a Historical-Comparative Study of the Serbi or Xianbei Branch of the Serbi-Mongolic Language Family, with an Analysis of Northeastern Frontier Chinese and Old Tibetan Phonology, Wiesbaden: Harrassowitz Verlag, →ISBN, →OCLC