Іващенко, Василь Трифонович, et al. “FACTORS AFFECTING THE FAILURE OF CALF LINES OF DRILLING RIGS”. PRECARPATHIAN BULLETIN OF THE SHEVCHENKO SCIENTIFIC SOCIETY. Number, no. 2(38), Feb. 2019, pp. 292-00, https://pvntsh.nung.edu.ua/index.php/number/article/view/55.