Šestinová, Oľga, Jozef Hančuľák, and Tomislav Špaldon. 2019. “Earthworms As Useful Bioindicator of Soils Contamination Around Košice City, Slovakia”. Nova Biotechnologica Et Chimica 18 (1):10–17. https://doi.org/10.2478/nbec-2019-0002.