Palacios, J., M. Paredes, T. Castillo, and O. Paredes. “Mortar for 3D Printers Using River Sand, Portland Cement and Hydraulic Lime”. Scientific Review Engineering and Environmental Sciences (SREES), vol. 29, no. 4, Dec. 2020, pp. 399-08, doi:10.22630/PNIKS.2020.29.4.34.