Hsiu (2015) suggests that the Angkuic languages originated in the Mekong River valley in the Sipsongpanna area, and subsequently dispersed upstream into western and central Yunnan.
Lexical innovations
Hsiu (2015)[1] lists the following lexical innovations in each Angkuic branch. Proto-Palaungic reconstructions are from Sidwell (2015).
^Proto-Xiaoheijiang U, a subgroup of Northern Angkuic
Sidwell, Paul. 2009. Classifying the Austroasiatic languages: history and state of the art. LINCOM studies in Asian linguistics, 76. Munich: Lincom Europa.
Luce, Gordon. n.d. Comparative lexicon For Austroasiatic list: Wa - Danang Palaung - En - Amok - Möng-Lwe-Hkamuk - Angku - Wa Kut - Son. m.s.
Luce, Gordon. n.d. Comparative lexicon: P'uman - Wa - La - Vü - Tailoi - Angku - Hkamuk - K'amu - Khmous - Lamet - P'eng (T'eng) - Nañang (Wa-Khmuk-Lemet Group (i)). m.s.
Simao Prefecture Ethnic Minority Affairs Bureau [思茂行署民族事务委员会编]. 1991. A study of the Bulang people [布朗族研究]. Kunming: Yunnan People's Press [云南人民出版社]. ISBN7-222-00803-9
Svantesson, Jan-Olof. 1988. "U." In Linguistics of the Tibeto-Burman Area, 11, no. 1: 64-133.
Svantesson, Jan-Olof. 1991. "Hu - a Language with Unorthodox Tonogenesis." In Austroasiatic Languages, Essays in honour of H. L. Shorto, edited by Jeremy H.C.S. Davidson. 67-80. School of Oriental and African Studies, University of London.
Wang Xingzhong [王兴中] & Zhao Weihua [赵卫华]. 2013. Geography and multilingualism in Lincang [临沧地理与双语使用]. Kunming: Yunnan People's Press [云南人民出版社]. ISBN978-7-222-08581-7
Yan Qixiang [颜其香] & Zhou Zhizhi [周植志]. 2012. Mon-Khmer languages of China and the Austroasiatic family [中国孟高棉语族语言与南亚语系]. Beijing: Social Sciences Academy Press [[[Social Sciences Literature Press]]].
Gazetteers and other Chinese government sources with lexical data
Nanjian County Gazetteer Commission [南涧县志编纂委员会编] (ed). 1993. Nanjian County Gazetteer [南涧彝族自治县志]. Chengdu: Sichuan Reference Press [四川辞书出版社].
Na Ruzhen [納汝珍], et al. (eds). 1994. Zhenkang County Ethnic Gazetteer [镇康县民族志]. Kunming: Yunnan People's Press [云南民族出版社].
Simao Prefecture Ethnic Minority Affairs Bureau [思茅行暑民族事务委员会] (ed). 1990. A study of the Bulang people [布朗族研究]. m.s.
Simao Prefecture Ethnic Minority Affairs Bureau [思茅行暑民族事务委员会] (ed). 1991. A study of the Bulang people [布朗族研究]. Kunming: Yunnan People's Press [云南人民出版社]. ISBN7222008039
Xiao Dehua [萧德虎], et al. (eds). 1992. Zhenkang County Gazetteer [镇康县志]. 1992. Chengdu: Sichuan People's Press [四川民族出版社].