Кушлик, О. Ю., and Л. І. Ріщук. “Use of Business Efficiency Control System in Strategic and Operational Activities of Enterprises”. Scientific Bulletin of Ivano-Frankivsk National Technical University of Oil and Gas (Series: Economics and Management in the Oil and Gas Industry) 2, no. 10 (December 12, 2014): 110-115. Accessed July 19, 2019. http://eung.nung.edu.ua/index.php/ecom/article/view/175.