О. Р. Онисько, В. І. Патра, and Б. Я. Прибуш, “DEFINITION OF PROFILE OF CUTTING TOOL PART WITH DOUBLE-INCLINED FACE SURFACE TO FORM TRIANGULAR THREAD OF OIL AND GAS PIPES ASSORTMENT”, ogpe, no. 2(24), pp. 77–81, Nov. 2015.