Kim Hoi, H. T., Tu, V. T. and Tien Trinh, N. C. (2014) “Effects of some physic - chemical characteristics of the soil on earthworms at the Tam Dao national park, Vinh Phuc province”, Academia Journal of Biology, 29(2), pp. 26–34. doi: 10.15625/0866-7160/v29n2.5370.