TYMOSHCHUK, OLEKSANDR. “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, Dec. 2023, pp. 373-9, https://doi.org/10.31891/2307-5732-2023-329-6-373-379.