Грудз, Ярослав Володимирович. “OUTPUT-INPUT RATIO OF TECHNICAL SYSTEMS AND GAS PIPELINES”. PRECARPATHIAN BULLETIN OF THE SHEVCHENKO SCIENTIFIC SOCIETY. Number, no. 1(25) (March 6, 2019): 158–170. Accessed December 6, 2025. https://pvntsh.nung.edu.ua/index.php/number/article/view/213.