Ramos, Maria Cristina, Roman Petruk, Vitalii Ishchenko, and Galyna Petruk. “SOURCES OF ENVIRONMENTAL THREATS IN EL-ORO PROVINCE (ECUADOR)”. Scientific Works of Vinnytsia National Technical University, no. 1 (July 5, 2017): 1–6. Accessed May 6, 2024. https://works.vntu.edu.ua/index.php/works/article/view/494.