I. Nikova and V. Tsolova, “Mobility of trace elements in arable soils from the Bobov dol valley, Bulgaria”, BJSSAE, vol. 51, no. 2, pp. 12–20, Jun. 2017, Accessed: Nov. 04, 2026. [Online]. Available: https://agriacad.eu/ojs/index.php/bjssae/article/view/1936