Gombás, Ádám, Edit Sárközi, Levente Kardos, and Zsuzsanna Angyal. “Determination of Three Small streams’ Chemical Water Quality in Budapest”. Economica 7, no. 3 (August 6, 2020): 69–75. Accessed March 7, 2021. https://ojs.lib.unideb.hu/economica/article/view/4385.