HOANG, T. T. H. An investigation into the hill vegetation partition in Duc Xuan ward – Bac Kan province. Journal of Technical Education Science, [S. l.], v. 6, n. 3, p. 64–68, 2011. Disponível em: https://www.jte.edu.vn/index.php/jte/article/view/770. Acesso em: 7 apr. 2026.