Stejskalová, L., L. Ansorge, J. Kučera, and E. Čejka. “Role of Wastewater Treatment Plants in Pollution Reduction - Evaluated by Grey Water Footprint Indicator”. Scientific Review Engineering and Environmental Studies (SREES), vol. 31, no. 1, Mar. 2022, pp. 26-36, doi:10.22630/srees.2313.