Vladov, I. et al. 2021. TRACE METALS IN A HOST – PARASITE SYSTEM (RATTUS SPP. – HYMENOLEPIS SPP.) IN THE AREA OF A COAL MINE COMPLEX MARITZA IZTOK IN BULGARIA. TRADITION AND MODERNITY IN VETERINARY MEDICINE. 6, 2 (Nov. 2021), 9–14. DOI:https://doi.org/10.5281/zenodo.5733921.