BACHEV, Hrabrin Ianouchev, and Bozhidar IVANOV. “Factors for Inclusion of Wastewater Treatment Sludgein Agri-Food Chain in Bulgaria”. Journal of Economics Library 8, no. 3 (October 29, 2021): 107–129. Accessed November 23, 2024. https://journals.econsciences.com/index.php/JEL/article/view/2232.