Прунько, І., Богатчук, І., Криштопа, С. and Долішній, Б. (2014) “Optimization of process parameters electrical spark hardening oil and gas transportation technology”, Problems of Tribology, 66(4), pp. 43–48. Available at: http://tribology.khnu.km.ua/index.php/ProbTrib/article/view/267 (Accessed: 25 September 2022).