D. Y. Iosifova, M. T. Marinova, and T. P. Popova, “RESEARCH OF THE MICROBIAL CONTAMINATION OF A LAKE IN THE CITY OF SOFIA WITH REGARD TO ASSESSMENT OF ITS ENVIRONMENTAL SAFETY”, Tradit. Mod. Vet. Med., vol. 8, no. 2, pp. 56–63, Nov. 2023.