. O. TYMOSHCHUK, “ANALYSIS AND EVALUATION OF THE ACCURACY OF METHODS FOR CALCULATING THE DENSITY OF CHANNELS AND THE COMBINED AREA OF THE CONTACT SURFACE OF LUBRICATION-FREE PISTON SEALS”, Herald of Khmelnytskyi National University. Technical sciences, vol. 315, no. 6(2), pp. 125–131, Dec. 2022, doi: 10.31891/2307-5732-2022-315-6(2)-125-131.