BARKMANN, U. B. Walther Heissig zum 90. Geburtstag. Acta Mongolica, [S. l.], v. 3, n. 215, p. 7–13, 2004. Disponível em: https://journal.num.edu.mn/actamongolica/article/view/6179. Acesso em: 19 oct. 2024.