Kovbasiuk, I. M., O. B. Martsynkiv, and B. O. Martsynkiv. “CAUSES OF POOR QUALITY CASING OF DIRECTIONAL WELLS AT THE DRILLING DEPARTMENT «UKRBURGAZ» AND METODS FOR THEIR ELIMINATION”. Oil and Gas Power Engineering, no. 1(31) (June 26, 2019): 26-35. Accessed September 21, 2020. http://nge.nung.edu.ua/index.php/nge/article/view/487.