Nguyen, T. D., B. Doan, and T. H. Pham Thi. “Immobilizing Bacillus Subtilis on the Carrier of Poly (acrylic acid)/Sodium Bentonite for Treating Sludge from Pangasius Fish Ponds”. Nuclear Science and Technology, vol. 6, no. 1, Mar. 2016, pp. 43-49, doi:10.53747/jnst.v6i1.145.