Zemlianka, O. O., and M. V. Hubinskyi. 2010. “Research of Influence of Floatation Processes on Productivity of Biogas Installation”. Visnyk of Vinnytsia Politechnical Institute, no. 3 (November):75-80. https://visnyk.vntu.edu.ua/index.php/visnyk/article/view/1687.