“DESIGN AND FABRICATION OF HYDRAULIC SPRING STIFFNESS TESTING MACHINE”. International Journal of Engineering Sciences & Management Research, [S. l.], v. 4, n. 2, p. 161–164, 2017. Disponível em: https://ijesmr.com/index.php/ijesmr/article/view/347. Acesso em: 27 apr. 2026.