Ясиніцький, Е.П., В.О. Лигін, and Р.Ю. Ярмілко. “Protective Solution During Extraction of Propane-Butane”. Proceedings of National Aviation University 38, no. 1 (January 1, 2009): 163–165. Accessed May 27, 2024. https://jrnl.nau.edu.ua/index.php/visnik/article/view/1686.