Duong, N., 		Huong, N., 		Huong, N., & 		Phuong, T.
(2019).
 Assessment of Geoheritage of Geosites in Dong Van District, Ha Giang Province.
<em>VNU Journal Of Science: Earth And Environmental Sciences, 35</em>(1).
doi:10.25073/2588-1094/vnuees.4302