Hai, H. T., D. N. Thanh, N. K. Son, P. V. Mach, L. H. Anh, N. K. Do, and D. N. Cuong. “Preliminary Research on the Environment and the Hydrobiological Characteristics of Freshwater Bodies in Phong Nha Cave Area, Quang Binh Province”. Academia Journal of Biology, vol. 25, no. 1, Aug. 2015, pp. 11-20, doi:10.15625/0866-7160/v25n1.6794.