Rudnyk-Ivashchenko, O., L. Mykhal’ska, and V. Schwartau. “Specificities of Changes in the Concentrations of Heavy Metals in Milk Thistle (Silybum Marianum (L.) Gaertn.)”. Agricultural Science and Practice, Vol. 2, no. 3, Dec. 2015, pp. 55-60, doi:10.15407/agrisp2.03.055.