Thanh Hanh, N.T., Minh Thanh, L.T., Binh, N.D. and Hop, D.V. 2014. The distribution and some biological characters of Bacillus thuringiensisin soil of Cat Ba national park. Academia Journal of Biology. 30, 3 (Nov. 2014), 129–135. DOI:https://doi.org/10.15625/0866-7160/v30n3.5444.