TYMOSHCHUK O. 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 [Internet]. 2022 Dec. 29 [cited 2026 Jan. 26];315(6(2):125-31. Available from: https://heraldts.khmnu.edu.ua/index.php/heraldts/article/view/953