Malcheva, Boyka, Pavlina Naskova, and Dragomir Plamenov Dimitrov. “DYNAMICS OF THE MICROBIOLOGICAL INDEXES AT LIME TREATMENT OF SLUDGES FROM A PURIFICATION PLANT”. ANNUAL JOURNAL OF TECHNICAL UNIVERSITY OF VARNA, BULGARIA 5, no. 2 (December 31, 2021): 146–155. Accessed October 2, 2025. https://aj.tu-varna.bg/index.php/ajtuv/article/view/256.