YONGWU, Z.; CHONGCONG, zhang; JIAN, Z. The coordinated development of Beijing-Tianjing-Hebei urban research. Advances in Social Sciences Research Journal, [S. l.], v. 2, n. 12, 2015. DOI: 10.14738/assrj.212.1721. Disponível em: https://journals.scholarpublishing.org/index.php/ASSRJ/article/view/1721. Acesso em: 5 may. 2024.