MahmoodM. A. S., ViktorovichR. Y., VyacheslavovichN. D., VladimirovichV. N., and ProtasovD. N., “A Comprehensive Review of Liquid Ring Vacuum Pumps and Compressors for Improving Global Efficiency and Energy Saving”, AJSE, vol. 21, no. 1, pp. 26 - 36, May 2022.