Tran, D., Q. Pham, T. Nguyen, T. Bui, and T. Tran. “A Model of Solute Diffusion in Unsaturated Double-Porosity Medium by Homogenization”. Science and Technology Development Journal, Vol. 20, no. K7, Nov. 2018, pp. 68-75, doi:https://doi.org/10.32508/stdj.v20iK7.1213.