Pawełczyk, Fatima, et al. “Variability of Trace Element Concentrations in Deposits of the Wolbrom and Otrębowskie Brzegi Peatlands: a Reflection of an Anthropogenic Impact: Https: doi.Org 10.26485 AGL 2018 10710”. Acta Geographica Lodziensia, vol. 107, Dec. 2018, pp. 175-90, https://czasopisma.ltn.lodz.pl/Acta-Geographica-Lodziensia/article/view/213.