CAI, Shaomin; CHENG , Wenping. Design and Analysis of Harmonic Drive Reduction Pump Jack for Dynamic Performance in Oil Extraction. International Journal of Mechanical and Electrical Engineering, London, U.K., v. 2, n. 1, p. 27–32, 2024. DOI: 10.62051/ijmee.v2n1.04. Disponível em: https://wepub.org/index.php/IJMEE/article/view/697. Acesso em: 29 apr. 2026.