Sofronov, Mikhail Viktorovich (1968) Грамматика тангутского языка [Grammatika tangutskovo jazyka, Grammar of the Tangut Language] (in Russian), character 0009
Han Xiaomang (2004) 西夏文正字研究 [A Study on XiXia Orthography] (in Chinese), character 0012; character variant 0012