“The Removal of Cu(II) by Composite Zeolite-Humate Sorbent in the Presence of Extraneous Electrolytes”. Visnyk of Vinnytsia Politechnical Institute, no. 4, Oct. 2018, pp. 23-27, https://visnyk.vntu.edu.ua/index.php/visnyk/article/view/2246.