Грудз, Володимир Ярославович. “PARAMETER ESTIMATION OF STEADY OPERATIONAL MODES OF GAS SUPPLY SYSTEMS”. PRECARPATHIAN BULLETIN OF THE SHEVCHENKO SCIENTIFIC SOCIETY. Number, no. 1(33), Feb. 2019, pp. 254-60, https://www.pvntsh.nung.edu.ua/index.php/number/article/view/123.