Aspects of this topic are discussed in the following places at Britannica.
...a number of dialects and languages spoken in Tibet and the Himalayas. Burmic (Burmese in its widest application) includes Yi (Lolo), Hani, Lahu, Lisu, Kachin (Jingpo), Kuki-Chin, the obsolete Xixia (Tangut), and other languages. The Tibetan writing system (which dates from the 7th century) and the Burmese (dating from the 11th century) are derived from the Indo-Aryan (Indic) tradition;...
in Tibeto-Burman languages: The Qiangic group )...known to Western scholars at the time the Conspectus was written (c. 1942–43) or published (1972). Ersu/Tosu is perhaps an indirect descendant of the extinct Xixia (also known as Tangut) language, once spoken in a powerful empire located in the far northwestern part of the Tibet Autonomous Region of China. Although the empire was destroyed by the Mongols...
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