U. D. Khanh, L. D. An, T. P. Tuan, T. T. H. Nga, B. Q. Dung, and N. T. Huong, “Overview of geographical conditions and natural resources of fifty islands on the Bac Bo coastline of Vietnam”, Vietnam J. Earth Sci., vol. 35, no. 4, pp. 318–326, Jun. 2014.