Harry-Ngei, N., I. Ubong, and P. N. Ede. “A Review of the Scrubber As a Tool for the Control of Flue Gas Emissions in a Combustion System”. European Journal of Engineering and Technology Research, vol. 4, no. 11, Nov. 2019, pp. 1-4, doi:10.24018/ejeng.2019.4.11.1561.