Minh, D., H. Minh, and N. Nhi. “Unbaked Materials from Mixtures of Waste Sludge of a Water Purification Plant, Fly Ash, and Water Glass”. Science & Technology Development Journal - Engineering and Technology, Vol. 4, no. 1, Feb. 2021, pp. 663-9, doi:https://doi.org/10.32508/stdjet.v4i1.754.