Varlamov, Y., et al. “THEORETICAL RESEARCH OF THE RECIPE OF SUPPLEMENTARY MATERIAL OF TECHNOLOGICAL PURPOSE FOR ENSURING ECOLOGICAL BEZ-PEPYKHYRA VYROPYRA: Array”. Municipal Economy of Cities. Series: «Information Technology and Engineering» , vol. 4, no. 157, Sept. 2020, pp. 134-9, https://khgts.kname.edu.ua/index.php/khgts/article/view/5645.