M. ALmusawi, Aqil, et al. “Effects of Soluble Lignocellulose Substances of Wood Particles on the Mechanical Properties of Lightweight Concrete”. International Journal of Engineering & Technology, vol. 7, no. 4.20, Nov. 2018, pp. 377-81, https://doi.org/10.14419/ijet.v7i4.20.26138.