JOLDASBAYEVA, A. . CALCULATION AND MODELING OF WORKING PRODUCTIVITY OF EXCAVATORS IN MINING ENTERPRISES. International Bulletin of Engineering and Technology, [S. l.], v. 3, n. 7, p. 33–38, 2023. Disponível em: https://internationalbulletins.com/intjour/index.php/ibet/article/view/891. Acesso em: 18 jan. 2026.