Hai, H. T.; Thanh, D. N.; Son, N. K.; Mach, P. V.; Anh, L. H.; Do, N. K.; Cuong, D. N. Preliminary Research on the Environment and the Hydrobiological Characteristics of Freshwater Bodies in Phong Nha Cave Area, Quang Binh Province. AJB 2015, 25, 11-20.