Doan, Manh Ha, and Elżbieta Gałka. “The Influence of Lithology and Tectonics on the Development of the Karst Landscape in the Dong Van Global Geopark, NE Vietnam”. GEOTOURISM (Geoturystyka), no. 50-51, July 2020, p. 2, https://doi.org/10.7494/geotour.2017.50-51.2.