O. TYMOSHCHUK, “STUDY OF THE ACCURACY OF IMPROVED METHODS OF CALCULATING THE TIGHTNESS PARAMETERS OF OIL-FREE PISTON SEALS”, Herald of Khmelnytskyi National University. Technical sciences, vol. 329, no. 6, pp. 373–379, Dec. 2023, doi: 10.31891/2307-5732-2023-329-6-373-379.